ICD-10 N10
Billable / Specific CCAcute pyelonephritis
About ICD-10-CM N10
ICD-10-CM code N10 represents Acute pyelonephritis. This is a billable/specific code in the Genitourinary System chapter (block N10). The 2026 edition of ICD-10-CM N10 became effective on October 1, 2025.
Coding Tips for N10
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
N10 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC 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 N10. Per CMS ICD-10-CM Tabular 2026.
- Acute infectious interstitial nephritis
- Acute pyelitis
- Acute tubulo-interstitial nephritis
- Hemoglobin nephrosis
- Myoglobin nephrosis
Use Additional Code
When coding N10, also report these additional codes when applicable.
- code (B95-B97), to identify infectious agent.
Inpatient DRG Impact, CC
1325:279 codes Acute pyelonephritis. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for N10
Local Coverage Determinations (LCDs) from CMS MACs that list N10 as a covered diagnosis.
Showing top 10 of 12 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing N10.
2 Medicare
CPT Codes Commonly Billed with N10
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
Convert N10 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| N10 | 59010 | 10000 |
| N10 | 59011 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To N10
Other codes in section N10-N16 (Renal tubulo-interstitial diseases).
ICD-10 N10, Billing FAQ
Is ICD-10 code N10 billable? +
Yes, N10 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 N10? +
ICD-10 N10 includes: Acute infectious interstitial nephritis; Acute pyelitis; Acute tubulo-interstitial nephritis, and 2 more clinical synonyms.
Is N10 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with N10? +
Procedures frequently paired with N10 include: 81001, 87086.
What ICD-9 codes does N10 map to? +
Per CMS GEMs, N10 maps to ICD-9 codes: 59010, 59011. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team