R74Header code — not billable

Abnormal serum enzyme levels

Chapter
18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Category
R74
Effective date
October 1, 2026

Related codes in category R74

R74.0Nonspec elev of levels of transamns & lactic acid dehydrgnseR74.01Elevation of levels of liver transaminase levelsYesR74.02Elevation of levels of lactic acid dehydrogenase [LDH]YesR74.8Abnormal levels of other serum enzymesYesR74.9Abnormal serum enzyme level, unspecifiedYes

Frequently asked questions

What is ICD-10 code R74?

R74 is an ICD-10-CM diagnosis code for Abnormal serum enzyme levels.

Is R74 a billable code?

No. R74 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is R74 in?

R74 falls under Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

When did R74 become effective?

R74 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to R74?

R74 belongs to category R74, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.