2027 ICD-10-CM Diagnosis Code N41.0Acute prostatitis

ICD-10-CM Codes›N00–N99›N40-N53›N41

ICD-10-CM N41.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N41.0 is a billable ICD-10-CM diagnosis code for acute prostatitis. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 35 closely related codes. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). Coders also document this condition as acute bacterial prostatitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory conditions of male genital organs.

Code Identity

ICD-10-CM Code
N41.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute prostatitis
Short Description
Acute prostatitis
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 CodeN41.0Acute prostatitis

Code EditsBilling

Medicare Code Editor checks that affect claim validity for N41.0.

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.

  • Acute bacterial prostatitis
  • Acute prostatitis
  • Prostatitis category I

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N41.0: 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.

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 N41.0, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming N41.0: 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

  • Acute Prostatitis

    an acute inflammatory process that affects the prostate gland. it is caused by bacteria, most often escherichia coli, proteus mirabilis, klebsiella, and pseudomonas aeruginosa.

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 N41.0 to ICD-9-CMHistory

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

ICD-9-CM
601.0 Acute prostatitis
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 N41.0Overview

What is the ICD-10 code for acute prostatitis?

The ICD-10-CM code for acute prostatitis is N41.0 (sometimes written as N410). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N41.0 (Inflammatory diseases of prostate) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute prostatitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N41.0 group to?

When acute prostatitis 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.

Is N41.0 a CC or MCC?

CMS lists N41.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 35 closely related codes in its exclusion list.

Who can N41.0 be reported for?

The Medicare Code Editor checks acute prostatitis against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.