D29.1 vs N40
D29.1 and N40 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on D29.1
enlarged prostate (N40.-)
D29.1
Benign neoplasm of prostate
Billable
- Chapter 2
- Neoplasms
- Section
- D10-D36
Indexed under
- Fibroadenoma › prostate
- Myoma › prostate
N40
Benign prostatic hyperplasia
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N40-N53
Use when the record says
- adenofibromatous hypertrophy of prostate
- benign hypertrophy of the prostate
- benign prostatic hypertrophy
- BPH
- enlarged prostate
- nodular prostate
- polyp of prostate
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027