A51.44 is the authoritative medical code for Secondary syphilitic nephritis. This classification is used in medical billing and clinical recording to specify the clinical criteria for secondary syphilitic nephritis (ICD-10-CM A51.44), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Secondary syphilitic nephritis is a billable ICD-10-CM diagnosis code A51.44. Excludes1 (not coded here): nonspecific and nongonococcal urethritis N34.1; Reiter's disease M02.3-. Excludes2 (not included here): human immunodeficiency virus HIV disease B20.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for A51.44 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- nonspecific and nongonococcal urethritis N34.1
- Reiter's disease M02.3-
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- human immunodeficiency virus HIV disease B20
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with A51.44?
Per Excludes1 instructions, A51.44 must not be reported with: nonspecific and nongonococcal urethritis (N34.1); Reiter's disease (M02.3-).
Can A51.44 be reported alongside related conditions?
Per Excludes2 instructions, A51.44 and the following may both be reported when both are present: human immunodeficiency virus [HIV] disease (B20).
Codes in This Family (17)
Official ICD-10-CM classifications in the same code family as A51.44, with their registry titles.
- A51 — Early syphilis
- A51.0 — Primary genital syphilis
- A51.1 — Primary anal syphilis
- A51.2 — Primary syphilis of other sites
- A51.3 — Secondary syphilis of skin and mucous membranes
- A51.31 — Condyloma latum
- A51.32 — Syphilitic alopecia
- A51.39 — Other secondary syphilis of skin
- A51.4 — Other secondary syphilis
- A51.41 — Secondary syphilitic meningitis
- A51.42 — Secondary syphilitic female pelvic disease
- A51.43 — Secondary syphilitic oculopathy
- A51.45 — Secondary syphilitic hepatitis
- A51.46 — Secondary syphilitic osteopathy
- A51.49 — Other secondary syphilitic conditions
- A51.5 — Early syphilis, latent
- A51.9 — Early syphilis, unspecified
Indexed Clinical Terms (2)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic), syphilitic (late), early (secondary)
- Syphilis, syphilitic (acquired), nephrotic syndrome (secondary)
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: