A Comparison between a SNOMED CT Problem List and the ICD-10-CM/PCS HIPAA Code Sets


In 2013 the United States will convert from the use of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) to the use of the International Classification of Diseases, Tenth Revision, Clinical Modification/Procedure Coding System (ICD-10-CM/PCS).

This study compares the approximately 5,000 terms in the July 2009 Clinical Observations Recording and Encoding (CORE) Problem List subset of the Systematized Nomenclature of Medicine–Clinical Terms (SNOMED CT) terminology produced by the National Library of Medicine with terms found in the January 2009 versions of ICD-10-CM/PCS.

比较是由单个个体和完成的used the internally defined concepts of “Exact,” “Inexact,” “Model” (one SNOMED CT term to many ICD-10-CM/PCS terms), “Not Elsewhere Classified,” “Not Otherwise Specified,” “Synonym,” and “Not Found” to classify the CORE Problem List terms according to the quality of the match. Among the CORE Problem List terms, 6.0 percent were not found in ICD-10-CM/PCS, and 69.1 percent had equivalent ICD-10-CM/PCS terms. The 13.0 percent of terms classified as “Inexact” could also be used directly assuming some acceptable loss of clinical precision. The 11.9 percent of terms classified as “Model” represent differences that require rule-based mapping. The results of this study suggest that ICD-10-CM/PCS meets the intended design goal of increased clinical precision but studies are needed to precisely define the depth of coverage.

Key Words: SNOMED CT; ICD-10; coding; problem lists


Today in the United States, healthcare professionals are focusing on the attributes that electronic health systems should have in order to meet the emerging definitions of “meaningful use” of electronic health records and requirements for certification of systems.1Following a timeline almost identical to that of these requirements, the financial and administrative reporting structure as defined by the Health Insurance Portability and Accountability Act of 1996 (HIPAA) is implementing a generational update to the reporting structure and code sets used.2为其临床使用实施这些更新的提供商需要在其行政系统中采取一条路径,以适应报告结构从ASC X12 4010A到5010标准的变化,并移至国际疾病分类中指定的代码集,第十修改,临床修改/程序编码系统(ICD-10-CM/PC)。3,4

此外,国家医学图书馆(问M) in 2003 made the emerging clinical terminology Systematized Nomenclature of Medicine–Clinical Terms (SNOMED CT) widely available to US healthcare professionals at no cost through the yearly payment of a fee to the copyright holder, first the College of American Pathologists and now the International Health Terminology Standards Development Organisation (IHTSDO).5Actual use of SNOMED CT in the United States is not well documented and is perhaps limited to testing and a few large healthcare institutions.6Hence, between now and 2014, US healthcare providers could be introducing two widely different terminologies, SNOMED CT for clinical documentation and ICD-10-CM/PCS for administrative reporting. This study explores the nature of the overlap between SNOMED CT and ICD-10-CM/PCS using a subset of terms.


During the 1990s SNOMED transformed from an organized listing of terms related to many aspects of medicine into a logically oriented reference terminology intended to cover most areas of medicine.7In 2000 it merged with the newly emerging version of the United Kingdom’s Read Codes to form SNOMED CT.8随着美国所有美国医疗保健用户的无成本到端用户分销许可,英国本已免费的分销以及随后转移的SNOMED CT版权所有版权所有,旨在开发普遍使用这个大规模术语系统的清晰。9

国际疾病分类(ICD), on which ICD-10-CM and ICD-10-PCS are based, is organized around the concept of a disease. Related terms within a disease are grouped into chapters. In addition to the chapters classifying terms by disease, other chapters contain broader, more general concepts such as signs and symptoms or causes. There is no formal relationship between the various chapters. Concepts within each chapter are grouped into term sets containing a perceived similar theme, such as diabetes. As ICD is technically a classification and not a terminology, terminal items generally consist of a disease concept plus a descriptive term, such as “Nephrotic syndrome with minor glomerular abnormality” (N04.0), where “Nephrotic syndrome” is the base disease term and “minor glomerular abnormality” is the coordinated descriptive portion. Note that the descriptive portion may be coordinated with many other base terms, even from other chapters.

逻辑上rela snom CT介绍了能力te terms from various basic concepts in order to better describe what is being observed. Its internal organization uses a series of hierarchies of terms, with the major focus being the disorder hierarchy, which is similar to the ICD disease concept. Its hierarchies include clinical finding (what is observed), event (what is taking place), procedure (what is being done), and many others. The intent is to have related atomic-level terms to describe all of medicine. A logical model defines the relationship between hierarchical terms; for example, elevated blood sugar is a finding related to diabetes. While many ICD-like terms exist in SNOMED CT, such as the above-mentioned “Nephrotic syndrome with minor glomerular abnormality,” which has a SNOMED CT code of 197593004, most terminal items are atomic-level terms that define a single concept. An atomic-level term is one idea that is then coordinated with other atomic-level terms to fully describe what is happening. Here we see the major difference between SNOMED CT and ICD-10-CM/PCS. Reported ICD-10-CM/PCS items, which represent the way clinicians communicate, exist at a level equivalent to coordinated SNOMED CT terms.

By treaty agreements, healthcare professionals worldwide currently use the International Classification of Diseases, Tenth Revision (ICD-10) for the international reporting of morbidity and mortality data, and several large nations have developed specific clinical modifications for morbidity reporting.10In the United States, the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) is currently used for official morbidity reporting, especially in claims transactions. The clinical usefulness of this version is well known to be quite limited.11, 12ICD-10 itself expands the clinical utility of the previous version, International Classification of Diseases, Ninth Revision (ICD-9), and the United States has enhanced that by producing a greatly expanded version for morbidity reporting, ICD-10-CM.13Additionally, the US inpatient procedure codes were changed to a new, greatly expanded version (ICD-10-PCS) encompassing a new approach.14

Many in the US healthcare community feel that the major use of clinical terminology is for the collection of information usually taken during an encounter, which is informally referred to as a problem list. The NLM has undertaken a project to present the SNOMED CT terms for use in documenting clinical problems frequently encountered at seven institutions, whether or not SNOMED CT documents them, and issuing periodic (currently yearly) updates.15That recent publication provides a description of how the user-supplied lists evolved into the Clinical Observations Recording and Encoding (CORE) Problem List, but a broadly based discussion of the suitability of the list for universal use is still needed.

Recently I presented an overview of the new clinical detail found in the new HIPAA code sets.16This study will use the July 2009 version of the CORE Problem List as a publicly available list of more than 5,000 broadly based SNOMED CT codes and compare them to terms in the January 2009 versions of ICD-10-CM and ICD-10-PCS. As noted, a broad consensus does not exist regarding the suitability of the CORE Problem List for general use; hence, this comparison will serve only to assess the level of correspondence of terms between SNOMED CT and ICD-10-CM/PCS.


The database used in the 2010 ICD-10-CM publication was expanded to include the descriptive notes found in the ICD-10-CM manual and was placed in SNOMED CT Release 1 database form.17, 18该研究的最终分析数据包括ICD-10-CM的三个表:一个概念表,其中包含名称和代码作为主要字段;描述表,包含概念表中的信息以及每个术语的其他行,其中包含包含夹杂物,排除和注释的注释ICD-10-CM手册中;和第三个表格,其中术语之间的关系。为ICD-10-PC准备了一组类似但有用的表。

SNOMED CT is usually presented in the form of an expanding, browsable hierarchical display that allows items to be viewed in the context of their neighbors. For this project, Onty EM was used for contextual viewing of SNOMED CT terms and their content.19Generally, ICD terms are not viewed in this fashion, so a hierarchical form in which each chapter formed a hierarchical tree was developed. To avoid developing a new browser, it was decided to use a freeware tool, Protégé, for browsing the ICD-10-CM/PCS terms.20Protégé requires that terms be placed in a markup language designed for ontologies, the Web Ontology Language (OWL). A Perl script was developed to convert the text-exported forms of the ICD-10-CM and ICD-10-PCS databases to OWL. (Perl is a programming language developed for Unix around 1987 as a common tool for text transformations. Versions now exist for most operating systems.) The CORE Problem List was imported into Excel, and columns were added for the matching ICD-10-CM/PCS term and the quality of the match.

The CORE Problem List terms were evaluated in SNOMED CT identifier order, though another order would have been equally suitable. For ICD-10-CM, a lexical search was made using the SNOMED CT fully specified name, less the parenthetical hierarchy information. The lexical search software used was word based and order independent so that all possible text matches would appear. If the term was not found in the concept table, the description table was searched because it added the inclusion terms. Because the concepts were repeated in the description table, sometimes the search of the concept table was omitted. In most attempts the initial search did not yield a match. In some cases this was due to typographical style differences such as the use of noncontextual helper words, the concatenation of coordinated terms in one terminology and the use of a dash in the other, or spelling differences, generally between European and American forms of the term. After adjustments were made for these differences, many of the terms were found. All terms were also reviewed against their placement in the SNOMED CT hierarchy and against any synonyms used, a required step for difficult term matches. When the SNOMED CT term was very precise, sometimes an ICD-10-CM match was found for a synonym or a parent term. In some cases one terminology used an older form of a current term that required investigation as to the exact nature of the match. If no candidate matches were found at this stage, the hierarchical form of ICD-10-CM was manually searched for likely candidates in the area where the SNOMED CT term could be expected, a step that was required for many of the SNOMED CT findings because the two terminologies had different logical and lexical approaches.

While similar tables and a Protégé file were created for ICD-10-PCS, it was found that the most efficient way to find a match was to use the ICD-10-PCS manual (as a PDF), the term index, and corresponding term tables. A universal problem in matching procedures was that SNOMED CT has a traditional approach that uses a procedure’s name. ICD-10-PCS is designed to enumerate what is actually done during a procedure, which may differ from what the procedure name describes. In many cases the ICD-10-PCS procedure noted was based on the standard steps expected when performing the named procedure.

Two final Excel tables containing the matches (aFull Modeland anExtended Model) are presented here as unreviewed supplemental material. (Please note that these are large files and may take a moment to open.)

The following categories were used to describe the quality of the match:

Exact。ICD-10-CM/PCS项是适合Snomed CT项的合适匹配。许多术语是Snomed CT项的词汇匹配,但这不是必需的。如上所述,由于样式而失败的许多术语因样式而有所不同。当两个术语中包含相同的层次标头项时,还使用了“精确”。在某些情况下,一项被归类为“精确”的比赛包含“ A”的Snomed CT结构和ICD-10-CM/PCS构造“ A和B”。例如,Snomed CT使用“脚踝的创伤性关节炎(疾病)”,ICD-10-CM使用“创伤性关节炎,未指定的脚踝和脚”。以下是另一项归类为“精确”的匹配:

SNOMED CT: Pituitary-dependent Cushing’s disease (disorder) (190502001)
ICD-10-CM: Pituitary-dependent Cushing’s disease (E24.0)

Inexact。匹配被发现在ICD-10-CM / pc,但不是一个s semantically close as the terms in an “Exact” match. The ability to use the ICD-10-CM/PCS term in a similar fashion to the SNOMED CT term is use-case dependent. An example of an “Inexact” match is the SNOMED CT term “Transitional cell carcinoma of kidney (disorder)” and the ICD-10-CM term “Malignant neoplasm of kidney, except renal pelvis.” The ability to use the ICD-10-CM/PCS term clinically is dependent on the morphology description in SNOMED CT. The following is another match classified as “Inexact”:

SNOMED CT: Ankle edema (finding) (102572006)
ICD-10-CM: Localized edema (R60.0)

。ICD-10-CM/PCS models the term differently from SNOMED CT. The SNOMED CT grouper term does not exist in ICD-10-CM/PCS but is modeled by other related terms. A supplemental table is provided to give a noninclusive set of examples as to how one SNOMED CT term relates to many ICD-10-CM/PCS terms. In that table all term-to-term matches are considered “Inexact” because they are dependent on clinical use. Also, in that table not all related ICD-10-CM/PCS terms are shown, with the truncation generally taking place at the highest level in the hierarchy of terms. The following is one example of a “Model” designation:

SNOMED CT: Diabetic polyneuropathy (disorder) (49455004)
Drug or chemical induced diabetes mellitus with neurological complications with diabetic polyneuropathy (E09.42)
Type 1 diabetes mellitus with diabetic polyneuropathy (E10.42)
Type 2 diabetes mellitus with diabetic polyneuropathy (E11.42)
Other specified diabetes mellitus with diabetic polyneuropathy (E13.42)

Synonym。The ICD-10-CM/PCS manual lists approximately 9,500 examples and notes for the codes as guidance to coders. “Synonym” was used to designate terms when a semantic match to the SNOMED CT terms was found in the ICD-10-CM/PCS notes but was not the main term. The following is an example of this situation:

SNOMED CT: Homozygous beta thalassemia (disorder) (26682008)
ICD-10-CM: Beta thalassemia (D56.1)
Inclusion term: Homozygous beta thalassemia

NOS (Not Otherwise Specified)。核心问题列表包含一个相当通用的ct术语,在许多情况下是层次结构标题项。在某些情况下,将这些与ICD-10-CM/PC中的等效标题项进行了比较。在许多情况下,一般术语在ICD-10-CM/PCS层次结构内深处,并且该比赛涉及“其他或未指定”作为主要术语。在许多情况下,这些术语列表包括主术语加上“ nos”,例如“抑郁,nos”。在这种情况下,NOS被用作对ICD编码世界中NOS的共同用途的比较术语,如以下示例:

SNOMED CT: Hordeolum (disorder) (397513003)
ICD-10-CM: Hordeolum externum (H00.01)
Inclusion term: Hordeolum NOS

NEC (Not Elsewhere Classified)。ICD-10-CM/PCS now uses very few of these terms. They appear in a similar fashion to the NOS terms described above and are listed for comparison in a similar way, as in the following example:

snom CT:手关节僵硬(发现)(249915009)
NF (Not Found)。These terms were not found in ICD-10-CM/PCS, for example:
Snomed CT:难治性贫血(形态异常)(128845005)
ICD-10-CM: Not Found

Reportable。除了匹配质量条款classified as to their suitability for use in US government claims reimbursement, specifically Medicare and Medicaid.


Overall only 6.0 percent of the concepts in the subset of SNOMED CT problems could not be matched to the ICD-10-CM/PCS code set in some fashion (seeTable 1). Of those that were found, 13.0 percent were inexact matches whose quality depends on use. Exact matches were found in 58.2 percent of the concepts, and 57.6 percent were deemed “reportable” under HIPAA rules.

Table 2shows the number of the nine SNOMED CT code types used in this version of the CORE Problem List and how the quality of match is distributed.Table 3shows the distribution of SNOMED CT code types by ICD-10-CM/PCS Chapter.

The list of extended model terms had 7,973 terms (see the extended model provided in the supplemental table). Analysis of these terms shows that 48.3 percent are found in the chapter relating to injuries (Chapter 19) and 19.2 percent are from ICD-10-PCS (procedure codes). The next highest percentage (5.9 percent) was found in the chapter on orthopedics (Chapter 13). Other chapters containing between 1 and 5 percent of terms in the extended model were those containing circulatory (Chapter 9; 4.0 percent), endocrine (Chapter 4; 3.7 percent), digestive (Chapter 11; 2.6 percent), and health status codes (Chapter 21; 2.2 percent). Most (75.4 percent) of these terms were reportable.


The existence of multiple terminologies covering the same area inhibits full utility of any given terminology. Users may decline to use terminologies that do not have added benefits. Developers may not provide tools that work over all terminologies. The increased clinical coverage of the new US administrative codes (ICD-10-CM/PCS) now allows a meaningful test of coverage with SNOMED CT that could not be done using the prior version.
The CORE Problem List provides a convenient list of approximately 5,000 SNOMED CT codes covering common clinical practice terms and is an adequate test sample for testing the breadth of coverage of SNOMED CT and another terminology in the same clinical space. By design, the CORE Problem List omits many of the terms provided by the submitting institutions and is intended only as a subset of problems anticipated in clinical practice.21

The largest limitation of this study is that one knowledgeable person did the comparison. If the list were presented as a final version for implementation, it would be unacceptable. The purpose of the study, however, was to see the level of comparison and areas of difference. For that purpose, having one person do the comparison is helpful because differences in reviewer views do not exist and comparison rules are applied consistently.

The study results indicated that only 6.0 percent of the CORE Problem List SNOMED CT terms are not found in the US ICD-10-CM/PCS code sets, and only 2.5 percent were key disorder terms. Of the morphology terms, about 76 percent are not found, the largest percentage of any SNOMED CT code type. ICD-10 does not cover morphology. The World Health Organization, which holds the copyright on ICD, uses ICD-O for morphology, and exclusion from ICD-10-CM is not deemed significant.22It is observed that these terms could be added to ICD-10-CM as codes if required. (The 2011 version of ICD-10-CM does add many of these terms, though an analysis is not presented here.) Of the other major SNOMED CT code types, findings, events, regime/therapy, and procedures have significant numbers of terms not found. These are code types that are extremely variable as to content, meaning, and timelines of addition, and it should be noted that later versions of the CORE Problem List have dropped some of these SNOMED CT types. The maintainers of ICD-10-CM/PCS would need to determine whether the significance of adding and maintaining this small number of terms is desired.

Terms classified as “Model” have many ICD-10-CM/PCS items matching the SNOMED CT one. The correct one depends on information that is not contained in the CORE Problem List but would be found generally in other clinical information. The one-to-many match derives from the formulaic nature of the ICD-10-CM/PCS codes.23Note that 12 percent of the Problem List terms fall into this category. A major implication is that matches may require nonsimple rules, particularly for those involving various ICD-10-CM/PCS chapters. “Inexact” matches are similar in that the specific needs of users determine the quality of the match. For many administrative and clinical purposes, the quality may be “good enough.” In those instances when specificity is required, it is not. Finally, an issue can be taken with the use of ICD-10-CM/PCS “A and B” terms being considered an “Exact” match. Recently questioned was the use of the “and” operator in ICD terms when the correct operator is “or.”24The issue is not one of the operators but of the modeling style the developers used. In the ICD model, imprecision of anatomical location is common, and one may feel these terms should have a match quality of “Inexact” instead of “Exact,” making the requirement need-dependent.25SNOMED CT is also not clear on the use of the operators (see “Closed fracture of tibia and fibula, shaft (disorder)” [208629000] and “Tendinitis AND/OR tenosynovitis of the elbow region (disorder)” [239965002] as examples). One should view the use of these operators as a choice the terminology designers made between placing the concept in the terminology model or developing it in the information model.

Analysis of the SNOMED CT terms noted with respect to a subset of ICD-10-CM/PCS terms they could relate to is revealing. The greatest number of terms relate to injury and procedure codes. A simple example for the injury terms is “Closed fracture of acromial end of clavicle (disorder)” (1658003), which is modeled by six ICD-10-CM codes (S42.031A–S42.036A) relating to laterality and displaced versus nondisplaced fractures. Many other SNOMED CT terms relating to injury have 100 or more related codes depending on detail desired. It is also interesting to observe that the number of “Model” terms (620) increased 12.8 times to 7,973 terms in the detail table, perhaps indicating why terminology maps are difficult to develop and maintain. Note that most of the extended model terms are reportable for reimbursement. The matched nonexpanded Problem List comparison indicates that just under 60 percent of the terms are reportable, perhaps indicating a developing difference in the precision required for general clinical use versus that required for payment.

Table 3 gives an indication of the extent of mapping difficulties by showing the SNOMED CT code types by ICD-10-CM/PCS chapters. Through the use of tables such as these we can identify the chapters with code types that contain many “Model” or “Inexact” matches that will pose greater difficulties in developing a map.


这项工作表明,通过在涉及核心问题清单和此类研究价值的临床决策中,使用为行政目的所需的代码集来实现的潜在成功。它还显示了ICD-10-CM和ICD-10-PC中需要增强和持续更新以保持成功使用的区域。应该注意的是,问题列表最有可能是Snomed CT术语的最常见用途,但不是唯一的一种。26Studies showing the extent of SNOMED CT clinical decision support and data capture are lacking. The use of SNOMED CT in sites contributing to the CORE Problem List was limited.27No studies involving ICD-10-CM/PCS, even pilot ones, exist showing use in a clinical site. ICD-9-CM is widely used for documentation of administrative data, but the limited clinical detail limits its use. Suggestions have recently appeared for programmed input of ICD-10-CM and ICD-10-PCS codes that could help address data capture after pilot study.28, 29The studies proposed here could help further the utility of the ICD-10-CM/PCS code sets that are scheduled for widespread use in 2013.

Clearly, even with the present code expansion, ICD-10-CM is not useful when greater depth of clinical information is required. This study indicates significant deficiencies in the areas of findings, morphology, and events that would require an ICD-10-CM code expansion on the order of 1,000 terms, with additional issues if procedures were included. Indeed, the decision to replace SNOMED CT terms in the CORE Problem List with ICD-10-CM/PCS terms that would yield similar clinical results is not simple. For many locations the CORE Problem List terms will suffice for the site’s clinical needs, and the introduction of two terminologies is thereby avoided. For locations with more complex clinical needs, the more extensive needs of the site will always require the use of two or more specialty terminologies, and replacement of SNOMED CT with ICD-10-CM/PCS in the problem list may complicate the site’s terminology issues.


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13. Department of Health and Human Services. “HIPAA Administrative Simplification: Modifications to Medical Data Code Set Standards to Adopt ICD-10-CM and ICD-10-PCS.”
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16. Steindel, S. J. “International Classification of Diseases, 10th Edition, Clinical Modification and Procedure Coding System: Descriptive Overview of the Next Generation HIPAA Code Sets.”Journal of the American Medical Informatics Association17, no. 3 (2010): 274–82.
17. Ibid.
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23. Steindel, S. J. “International Classification of Diseases, 10th Edition, Clinical Modification and Procedure Coding System: Descriptive Overview of the Next Generation HIPAA Code Sets.”
24. Nadkarni,P。M.和J. A. Darer。“将现有的临床内容从ICD-9迁移到打nom。”
25. Steindel,S。J.“国际疾病分类,第10版,临床修改和程序编码系统:下一代HIPAA代码集的描述性概述。”
26. Giannangelo, K., and S. H. Fenton. 2008. “SNOMED CT Survey: An Assessment of Implementation in EMR/EHR Applications.”
27. Fung, K. W., C. McDonald, and S. Srinivasan. “The UMLS-CORE Project: A Study of the Problem List Terminologies Used in Large Healthcare Institutions.”
28. Steindel, Steven J. “Taking ICD-10-CM in Parts.” AHIMA. January 1, 2011. Available athttp://journal.ahima.org/2011/01/01/taking-icd-10-cm-in-parts/(accessed February 23, 2011).
29. Steindel, Steven J. “Learning and Using ICD-10-PCS.” AHIMA. February 9, 2011. Available athttp://journal.ahima.org/2011/02/09/learning-and-using-icd-10-pcs/(accessed February 23, 2011).

Steven J. Steindel, PhD, FACMI. “A Comparison between a SNOMED-CT Problem List and ICD-10 HIPAA Code Sets.” Perspectives in Health Information Management (Winter 2012): 1-16.

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