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ICD-9-CM diagnosis code (retired)

999.9 — Other and unspecified complications of medical care, not elsewhere classified

ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.

About ICD-9-CM 999.9

999.9 is an ICD-9-CM diagnosis code for other and unspecified complications of medical care, not elsewhere classified. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.

The CMS General Equivalence Mappings translate it to 2 ICD-10-CM codes, such as T88.8XXA (Other specified complications of surgical and medical care, not elsewhere classified, initial encounter) and T88.9XXA (Complication of surgical and medical care, unspecified, initial encounter). All of these are approximate matches, so review the record to pick the right one.

ICD-10-CM equivalents

Common questions about 999.9

What is the ICD-10 code for ICD-9 999.9?

The GEMs map 999.9 to ICD-10-CM T88.8XXA and T88.9XXA.

GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.