ICD 9 to 10 Bidirectional Crosswalk Tool

Updated 2017 ICD-10-CM Codes

Please use the two steps below to translate ICD-9-CM and ICD-10-CM codes. Please note this tool is not designed to provide perfect matches between the two coding systems. In fact, except for a minority of cases, perfect matches between the ICD-9-CM and ICD-10-CM coding systems do not exist.

ICD-9-CM <= > ICD-10-CM Code Translation Tool

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What Is the ICD-9-CM to ICD-10-CM Forward and Backward Translation Tool

On October 1st 2015, health care institutions in the United States have transitioned to the new, greatly expanded ICD-10 diagnosis and procedures code classification system. The ICD-9 classification database contained 14,315 diagnosis codes and 3,838 procedure codes. The ICD-10 database has 69,101 diagnosis codes and 71,957 procedure codes. Hospitals and clinics rely heavily on these codes, among other things, to get reimbursed for services they provide. The transition to ICD-10 is expected to be a difficult one on many levels, and in an effort to assist providers (including myself :-)) and coders during this process, I developed this translation tool.

The main source I used in developing the ICD-9 to ICD-10 code conversion tool was General Equivalence Mappings (GEMs) put together by the National Center for Health Statistics (NCHS), the Centers for Medicare and Medicaid Services (CMS), AHIMA, the American Hospital Association, and 3M Health Information Systems.

It is important to keep in mind that this translation tool does not produce exact matches in all cases. Just as some words in, say, English don't have an exact correspondent in Spanish, ICD-9 or ICD-10 code translations produce, more often than not, an approximate match or even multiple matches (see examples below). And this should be no surprise given there are almost five times more ICD-10 codes than ICD-9 ones.

Perfect Matches for ICD-9 to ICD-10 Forward and Backward Crosswalk

For a number of conditions, there is a direct match between the ICD-9 and ICD-10 coding systems. Here are a few examples:

ICD-9 Code Description ICD-10 Code Description
131.01 Trichomonal vulvovaginitis A59.01 Trichomonal vulvovaginitis
728.86 Necrotizing fasciitis M72.6 Necrotizing fasciitis
599.70 Hematuria, unspecified R31.9 Hematuria, unspecified
786.02 Orthopnea R06.02 Shortness of breath

Approximate Matches for ICD-9 to ICD-10 Forward and Backward Crosswalk

Given the significant increase in detail and specificity in the ICD-10 coding system, there are many instances where there is no direct match between the ICD-9 and ICD-10 codes. Note in the examples below that in some instances, there is only one ICD-10 code returned. In others, there are more. The important thing to remember is that even when there is only one ICD-10 code returned, it is not completely equivalent to the source ICD-9 code, and the conversion tool above alerts you on that.

ICD-9 Code Description ICD-10 Code(s) Description
053.20 Herpes zoster dermatitis of eyelid B02.39 Other herpes zoster eye disease
233.0 Carcinoma in situ of breast D05.99 Unspecified carcinoma in situ of unspecified breast
274.00 Gouty arthropathy, unspecified M10.00 Idiopathic gout, unspecified site
599.72 Microscopic hematuria R31.1 Benign essential microscopic hematuria
R31.2 Other microscopic hematuria
666.02 Third-stage postpartum hemorrhage, delivered, with mention of postpartum complication O72.0 Third-stage hemorrhage
O43.221 Placenta increta, first trimester
O43.233 Placenta percreta, third trimester
O43.232 Placenta percreta, second trimester
O43.231 Placenta percreta, first trimester
O43.223 Placenta increta, third trimester
O43.213 Placenta accreta, third trimester
O43.212 Placenta accreta, second trimester
O43.211 Placenta accreta, first trimester
O43.222 Placenta increta, second trimester

No ICD-9 to ICD-10 Matches

There are some instances where there is not even an approximate match between the ICD-9 and ICD-10 coding systems. Here are a few examples:

ICD-9 Code Description ICD-10 Code Description
707.20 Pressure ulcer, unspecified stage, Pressure ulcer - No match
E850.0 Accidental poisoning by heroin - No match
E949.6 Other and unspecified viral and rickettsial vaccines causing adverse effects in therapeutic use - No match

Questions & Feedback

The comment section above is part of our recently launched ICD-10 codes discussion forum.