ICD-10-CM 2027
ICD-10 code for prostate irregular
From the official ICD-10-CM alphabetic index entry “Irregular, irregularity › prostate”. Page updated September 29, 2026.
About coding prostate irregular
The ICD-10-CM code for prostate irregular is N42.9 (Disorder of prostate, unspecified).
Within N42, choose N42.9 (Disorder of prostate, unspecified) only when documentation doesn't support a more specific option: calculus of prostate (N42.0), congestion and hemorrhage of prostate (N42.1), dysplasia of prostate (N42.3) and other specified disorders of prostate (N42.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 729 (Other Male Reproductive System Diagnoses with CC/MCC, relative weight 1.0544) and DRG 730 (Other Male Reproductive System Diagnoses without CC/MCC, relative weight 0.6597), in MDC 12 (Diseases and Disorders of the Male Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about prostate irregular ICD-10 codes
What is the ICD-10 code for prostate irregular?
- N42.9 — Disorder of prostate, unspecified.
Is N42.9 billable?
- Yes. N42.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N42.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N42.9 as a principal diagnosis.
Is N42.9 a CC or MCC?
- No. N42.9 is neither a CC nor an MCC under MS-DRG v44.0.