ICD-10 A27.81
Billable / Specific MCCAseptic meningitis in leptospirosis
About ICD-10-CM A27.81
ICD-10-CM code A27.81 represents Aseptic meningitis in leptospirosis. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A27). The 2026 edition of ICD-10-CM A27.81 became effective on October 1, 2025.
Coding Tips for A27.81
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A27.81 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.
Inpatient DRG Impact, MCC
codes Aseptic meningitis in leptospirosis. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for A27.81
Local Coverage Determinations (LCDs) from CMS MACs that list A27.81 as a covered diagnosis.
Showing top 10 of 45 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A27.81.
3 Medicare
CPT Codes Commonly Billed with A27.81
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 70491 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70487 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70490 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70481 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70480 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70482 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70486 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70557 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70488 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
- 70558 CMS LCD: Billing and Coding: MRI and CT Scans of the Head and Neck CMS LCD
Convert A27.81 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 |
|---|---|---|
| A27.81 | 10081 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A27.81
Other codes in section A20-A28 (Certain zoonotic bacterial diseases).
ICD-10 A27.81, Billing FAQ
Is ICD-10 code A27.81 billable? +
Yes, A27.81 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Is A27.81 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.
What CPT codes are commonly billed with A27.81? +
Procedures frequently paired with A27.81 include: 70491, 70487, 70490, 70481, 70480.
What ICD-9 codes does A27.81 map to? +
Per CMS GEMs, A27.81 maps to ICD-9 codes: 10081. 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 July 16, 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