2026 ICD-10-CM Diagnosis Code N51Disorders of male genital organs in diseases classified elsewhere
ICD-10-CM Codes›N00–N99›N40-N53›N51
- Billable — Valid for Submission
- Not Chronic
N51 is a billable ICD-10-CM diagnosis code for disorders of male genital organs in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 729 through 730. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as chylocele. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified male genital disorders.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for N51.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chylocele
- Chylocele of tunica vaginalis caused by Loa loa
- Epididymitis associated with another disorder
- Infection by Loa loa
- Infection caused by Loa
- Male genital organ disorder associated with another disorder
- Orchitis associated with another disorder
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
Type 1 Excludes
- amebic balanitis A06.8
- candidal balanitis B37.42
- gonococcal balanitis A54.23
- gonococcal prostatitis A54.22
- herpesviral herpes simplex balanitis A60.01
- trichomonal prostatitis A59.02
- tuberculous prostatitis A18.14
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Penis Disorders
Problems with the penis can cause pain and affect a man's sexual function and fertility. Penis disorders include:
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Convert N51 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N51Overview
Is N51 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report disorders of male genital organs in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does N51 group to?
On inpatient claims, disorders of male genital organs in diseases classified elsewhere maps to MS-DRG 729, 730, with relative weights from 0.6720 to 1.0587 depending on complications. Higher weights mean higher Medicare reimbursement.
Can N51 be a principal diagnosis?
No. This is a manifestation code: disorders of male genital organs in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
What is the ICD-9 equivalent of N51?
Under the General Equivalence Mappings, disorders of male genital organs in diseases classified elsewhere converts to ICD-9-CM 608.81 (male gen dis in oth dis). The mapping is approximate, so confirm the match fits the documentation.
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.
