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American Association of Oral and Maxillofacial Surgeons

Practice Management & Allied Staff News & Materials

General Equivalence Mappings: ICD-9 to ICD-10

April 8th, 2013

General Equivalence Mappings: ICD-9 to ICD-10
March 20, 2013
On October 1, 2014 the ICD-9-CM coding classification system will be replaced by ICD-10-CM. Oral and maxillofacial surgeons and their staff will need to be prepared for the increased number of codes, the organization and structure, code composition, and increased level of detail found in ICD-10-CM. The Centers for Disease Control and Prevention (CDC) has created General Equivalency Mappings (GEMs) as a resource to assist professionals in learning the ICD-10-CM coding system by using the ICD-9-CM system they have been familiar with for years. GEM’s are described by the CDC as a “target system to present all reasonable corresponding diagnosis codes between ICD-9-CM to ICD-10-CM, if a corresponding code is available”. The GEM’s provided on the CDC’s website, attempt to organize all crosswalk possibilities by linking current ICD-9 to any valid ICD-10 alternatives. Please note, there is not always a simple crosswalk from the smaller, less detailed ICD-9 to the more specific and thorough ICD-10. There could be multiple ICD-10-CM codes to replace one ICD-9 code.

An example of a simple crosswalk from an ICD-9 code to an ICD-10 code that will be commonly used by AAOMS members:


ICD-9-CM


ICD-10-CM

525.23 Severe atrophy of the mandible K08.23 Severe atrophy of the mandible

An example of a complex crosswalk from an ICD-9 code to an ICD-10 code that will be commonly used by AAOMS members:


ICD-9-CM


ICD-10-CM

525.10 Acquired absence of teeth, unspecified K08.101 Complete loss of teeth, unspecified cause, class I
K08.102 Complete loss of teeth, unspecified cause, class II
K08.103 Complete loss of teeth, unspecified cause, class III
K08.104 Complete loss of teeth, unspecified cause, class IV
K08.109 Complete loss of teeth, unspecified cause, unspecified class
K08.401 Partial loss of teeth, unspecified cause, class I
K08.402 Partial loss of teeth, unspecified cause, class II
K08.403 Partial loss of teeth, unspecified cause, class III
K08.404 Partial loss of teeth, unspecified cause, class IV
K08.409 Partial loss of teeth, unspecified cause, unspecified class

Optum (formerly Ingenix), an AAOMS Services Inc. approved program, has created an ICD-9 to ICD-10 Mappings Manual to be used as a reference guide. The manual should not be used for direct coding purposes because it does not indicate laterality, include a code’s inclusion and exclusion notes, tabular cross-references, and/or the level of encounter for the patient. The mappings manual was created to simply provide a series of possible compromises with multiple ICD-10-CM codes rather than a mirror image of one code to another in the new code set. Mappings may assist with converting super bills, patient forms, and EHRs/PHRs by providing a target code(s), however any code selection must be verified in the ICD-10-CM manual. This mapping manual, along with the ICD-10 Draft Code Set Manual, can be found on the Optum website. Optum has also created a software program called EncoderPro which includes content from all necessary coding products. The EncoderPro can be used to familiarize physicians and their staff with ICD-10 code content and mapping information in to both code ICD-9 and to prepare for the transition to ICD-10.
The CDC provides the public with annual updates to the GEMs with the changes/updates made to ICD-9-CM and ICD-10-CM. GEMS may be found on the CDC website along with additional information on ICD-10-CM coding.