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N42.0 ICD-10-CM Code: Calculus of prostate

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 729 — OTHER MALE REPRODUCTIVE SYSTEM DIAGNOSES WITH CC/MCC (MDC 12)
  • MS-DRG 730 — OTHER MALE REPRODUCTIVE SYSTEM DIAGNOSES WITHOUT CC/MCC (MDC 12)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for N42.0 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Prostatic stone

Code Overview

Calculus of prostate is a billable ICD-10-CM diagnosis code (N42.0).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • Age-restricted: the Medicare Code Editor lists this as an adult (age 15-124) diagnosis; other ages are presumed incorrect.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name N42.0 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes2 note: N21.1 — Calculus in urethra.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 729 (MDC 12), DRG 730 (MDC 12).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):GEN016 — Other specified male genital disorders (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified male genital disorders).

N42.1 — Congestion and hemorrhage of prostate, N42.3 — Dysplasia of prostate, N42.30 — Unspecified dysplasia of prostate, N42.31 — Prostatic intraepithelial neoplasia, N42.32 — Atypical small acinar proliferation of prostate, N42.39 — Other dysplasia of prostate, N42.81 — Prostatodynia syndrome, N42.82 — Prostatosis syndrome, N42.83 — Cyst of prostate, N42.89 — Other specified disorders of prostate, N42.9 — Disorder of prostate, unspecified, N43.0 — Encysted hydrocele, N43.1 — Infected hydrocele, N43.2 — Other hydrocele, N43.3 — Hydrocele, unspecified, N43.40 — Spermatocele of epididymis, unspecified, N43.41 — Spermatocele of epididymis, single, N43.42 — Spermatocele of epididymis, multiple, N44.00 — Torsion of testis, unspecified, N44.01 — Extravaginal torsion of spermatic cord, +45 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Calculus, calculi, calculous”, “Stone”; these codes share that main term but sit in a different category of the Tabular List.

K80.70 — Calculus of gallbladder and bile duct without cholecystitis without obstruction (gallbladder and bile duct), K80.71 — Calculus of gallbladder and bile duct without cholecystitis with obstruction (gallbladder and bile duct, with, obstruction), K80.80 — Other cholelithiasis without obstruction (hepatobiliary), K80.81 — Other cholelithiasis with obstruction (hepatobiliary, with obstruction), K86.89 — Other specified diseases of pancreas (pancreas), N13.2 — Hydronephrosis with renal and ureteral calculous obstruction (ureter, with hydronephrosis), N13.6 — Pyonephrosis (pyelitis, with hydronephrosis), N20.0 — Calculus of kidney (renal), N20.1 — Calculus of ureter (ureter), N20.2 — Calculus of kidney with calculus of ureter (kidney, with calculus, ureter), N20.9 — Urinary calculus, unspecified (urinary), N21.0 — Calculus in bladder (bladder), N21.1 — Calculus in urethra (urethra), N21.8 — Other lower urinary tract calculus (urinary, specified NEC), N21.9 — Calculus of lower urinary tract, unspecified (urinary, lower tract), N50.89 — Other specified disorders of the male genital organs (epididymis), N89.8 — Other specified noninflammatory disorders of vagina (vagina), Q38.4 — Congenital malformations of salivary glands and ducts (sublingual duct or gland, congenital), Q63.8 — Other specified congenital malformations of kidney (kidney, congenital), R92.1 — Mammographic calcification found on diagnostic imaging of breast (mammographic), +49 more

Contextual Map

Every relationship of N42.0 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run N42.0 with this related code in Claim Check

Hierarchy

Referenced by Excludes2 notes

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 12 — Diseases and Disorders of the Male Reproductive System[MDC crossing]: “Diseases and Disorders of the Male Reproductive System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1,964 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Calculus, calculi, calculous, prostate[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Stone (s), prostate[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (13)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "N42.0 — Calculus of prostate." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/n42.0-calculus-of-prostate

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Calculus of prostate

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N42.0 in its code family, with their registry titles.

View all codes in the N42 family