2026 ICD-10-CM Diagnosis Code N41.9Inflammatory disease of prostate, unspecified

ICD-10-CM Codes›N00–N99›N40-N53›N41

ICD-10-CM N41.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N41.9 is a billable ICD-10-CM diagnosis code for inflammatory disease of prostate, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 727 through 728. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). Coders also document this condition as asymptomatic prostatitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory conditions of male genital organs.

Code Identity

ICD-10-CM Code
N41.9
Billable Status
Yes — Valid for Submission
Code Describes
Inflammatory disease of prostate, unspecified
Short Description
Inflammatory disease of prostate, unspecified
Same as the full description in the CMS dataset.
Parent Code
N41
Inflammatory diseases of prostate

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN40-N53Diseases of male genital organs
CategoryN41Inflammatory diseases of prostate
This CodeN41.9Inflammatory disease of prostate, unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for N41.9.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Asymptomatic prostatitis
  • Bacterial prostatitis
  • Chlamydial prostatitis
  • Prostatitis
  • Prostatitis associated with another disorder
  • Ulcer of prostate

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Prostatitis NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Prostatitis(congestive) (suppurative) (with cystitis)
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • prostate

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN013
Inflammatory conditions of male genital organs
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Prostatitis

    infiltration of inflammatory cells into the parenchyma of prostate. the subtypes are classified by their varied laboratory analysis, clinical presentation and response to treatment.

  • Prostate

    a gland in males that surrounds the neck of the urinary bladder and the urethra. it secretes a substance that liquefies coagulated semen. it is situated in the pelvic cavity behind the lower part of the pubic symphysis, above the deep layer of the triangular ligament, and rests upon the rectum.

  • Acute Bacterial Prostatitis|acute bacterial prostatitis

    an acute infection of the prostate gland caused by bacteria, most often escherichia coli, proteus mirabilis, klebsiella, and pseudomonas aeruginosa. signs and symptoms include fever, lower back pain, urinary frequency, and painful urination. the urinalysis reveals the presence of white cells. risk factors include intraprostatic ductal reflux, phimosis, urinary tract infections, and unprotected anal intercourse.

  • Bacterial Prostatitis

    an acute or chronic bacterial infection that affects the prostate gland.

  • Chronic Bacterial Prostatitis|chronic bacterial prostatitis

    a chronic infection of the prostate gland caused by bacteria. it is manifested with recurring urinary tract infections. the culture of the prostatic fluid, semen, or post-massage urine specimen reveals the presence of bacteria.

Patient EducationClinical

Prostate Diseases

The prostate is a gland in the male reproductive system. It lies just below the bladder. It makes fluid that is part of semen.

The full article covers:

  • What is the prostate?
  • What are prostate diseases?
  • Who is more likely to develop prostate diseases?
  • What are the symptoms of prostate diseases?
  • How are prostate diseases diagnosed?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N41.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
601.9 Prostatitis NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N41.9Overview

Is N41.9 (Inflammatory diseases of prostate) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report inflammatory disease of prostate, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N41.9 group to?

When inflammatory disease of prostate, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 727, 728, with relative weights from 0.8112 to 1.4829 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can N41.9 be reported for?

The Medicare Code Editor checks inflammatory disease of prostate, unspecified against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of N41.9?

Under the General Equivalence Mappings, inflammatory disease of prostate, unspecified converts to ICD-9-CM 601.9 (prostatitis NOS). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.