ICD-10 N00.A
Billable / Specific MCCAcute nephritic syndrome with C3 glomerulonephritis
About ICD-10-CM N00.A
ICD-10-CM code N00.A represents Acute nephritic syndrome with C3 glomerulonephritis. This is a billable/specific code in the Genitourinary System chapter (block N00). The 2026 edition of ICD-10-CM N00.A became effective on October 1, 2025.
Coding Tips for N00.A
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
N00.A is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under N00.A. Per CMS ICD-10-CM Tabular 2026.
- Acute nephritic syndrome with C3 glomerulopathy, NOS
Type 1 Excludes
Pure excludes, these codes can never be coded together with N00.A. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- Acute nephritic syndrome (with C3 glomerulopathy) with dense deposit disease (N00.6)
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Inpatient DRG Impact, MCC
codes Acute nephritic syndrome with C3 glomerulonephritis. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for N00.A
Local Coverage Determinations (LCDs) from CMS MACs that list N00.A as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing N00.A.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but N00.A doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with N00.A
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To N00.A
Other codes in section N00-N08 (Glomerular diseases).
ICD-10 N00.A, Billing FAQ
Is ICD-10 code N00.A billable? +
Yes, N00.A is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to N00.A? +
ICD-10 N00.A includes: Acute nephritic syndrome with C3 glomerulopathy, NOS.
What codes are Type 1 Excludes for N00.A? +
Type 1 Excludes (never code together with N00.A): Acute nephritic syndrome (with C3 glomerulopathy) with dense deposit disease (N00.6)
Is N00.A a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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