2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N41.9: its own notes plus those printed at N41 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Prostatitis NOS

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From N41 Inflammatory diseases of prostate applies to 7 codes
  • code (B95-B97), to identify infectious agent.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N41.9, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming N41.9: they are not reported together with it, unless the two conditions are unrelated.

  • N42.1 Congestion and hemorrhage of prostate
    inflammatory diseases of prostate (N41.-) names N41.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N41.9Overview

What is the ICD-10 code for inflammatory disease of prostate, unspecified?

The ICD-10-CM code for inflammatory disease of prostate, unspecified is N41.9 (sometimes written as N419). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 0.8220 to 1.3694 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.

Does N41.9 need an additional code?

When the condition applies, yes. The Use Additional Code note at N41, which applies to N41.9, reads: code (B95-B97), to identify infectious agent.. The additional code is reported after N41.9.