N42.31 Prostatic intraepithelial neoplasia

Billable ICD-10-CM code, FY2026.

Applicable to

• PIN
• Prostatic intraepithelial neoplasia I (PIN I)
• Prostatic intraepithelial neoplasia II (PIN II)

Excludes1 (never code together)

• prostatic intraepithelial neoplasia III (PIN III) (D07.5)

MS-DRG index

Defines the logic of DRG(s) 729-730 in MDC 12.

Approximate ICD-9-CM (GEMs)

• 602.3 Dysplasia of prostate (approximate)

Code annotations containing back-references to N42.31

Back-references to N42.3

• Type 1 Excludes: D07.5 Carcinoma in situ of prostate ("dysplasia (mild) (moderate) of prostate (N42.3-)")
• Type 1 Excludes: D07.5 Carcinoma in situ of prostate ("prostatic intraepithelial neoplasia II [PIN II] (N42.3-)")

Diagnosis Index entries for N42.31

• Neoplasia › intraepithelial (histologically confirmed) › prostate (histologically confirmed) (PIN)
• Neoplasia › intraepithelial (histologically confirmed) › prostate (histologically confirmed) (PIN) › grade I
• Neoplasia › intraepithelial (histologically confirmed) › prostate (histologically confirmed) (PIN) › grade II

Nearby codes

• N42 Other and unspecified disorders of prostate
• N42.0 Calculus of prostate
• N42.1 Congestion and hemorrhage of prostate
• N42.3 Dysplasia of prostate
• N42.30 Unspecified dysplasia of prostate
• N42.31 Prostatic intraepithelial neoplasia (this code)
• N42.32 Atypical small acinar proliferation of prostate
• N42.39 Other dysplasia of prostate
• N42.8 Other specified disorders of prostate
• N42.81 Prostatodynia syndrome
• N42.82 Prostatosis syndrome