ICD-10-CM 2027
ICD-10 code for testis undeveloped
From the official ICD-10-CM alphabetic index entry “Undeveloped, undevelopment › testis”. Page updated September 29, 2026.
About coding testis undeveloped
The ICD-10-CM code for testis undeveloped is E29.1 (Testicular hypofunction).
Within E29 (testicular dysfunction), E29.1 is specifically for testicular hypofunction. Related codes cover testicular hyperfunction (E29.0), other testicular dysfunction (E29.8) and unspecified (E29.9).
Don't report E29.1 together with the conditions in its Excludes1 note: postprocedural testicular hypofunction (E89.5).
Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).
Don't confuse with (Excludes1 for E29.1)
- postprocedural testicular hypofunction (E89.5)
Common questions about testis undeveloped ICD-10 codes
What is the ICD-10 code for testis undeveloped?
- E29.1 — Testicular hypofunction.
Is E29.1 billable?
- Yes. E29.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E29.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E29.1 as a principal diagnosis.
Is E29.1 a CC or MCC?
- No. E29.1 is neither a CC nor an MCC under MS-DRG v44.0.