ICD-10 B05.0
Billable / Specific MCCMeasles complicated by encephalitis
About ICD-10-CM B05.0
ICD-10-CM code B05.0 represents Measles complicated by encephalitis. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block B05). The 2026 edition of ICD-10-CM B05.0 became effective on October 1, 2025.
Coding Tips for B05.0
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
B05.0 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 B05.0. Per CMS ICD-10-CM Tabular 2026.
- Postmeasles encephalitis
Inpatient DRG Impact, MCC
codes Measles complicated by encephalitis. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for B05.0
Local Coverage Determinations (LCDs) from CMS MACs that list B05.0 as a covered diagnosis.
Showing top 10 of 62 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing B05.0.
4 Medicare
CPT Codes Commonly Billed with B05.0
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 95929 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92651 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92653 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95928 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95930 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92652 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95939 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95708 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
- 95721 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
- 95719 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
Convert B05.0 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 |
|---|---|---|
| B05.0 | 0550 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To B05.0
Other codes in section B00-B09 (Viral infections characterized by skin and mucous membrane lesions).
ICD-10 B05.0, Billing FAQ
Is ICD-10 code B05.0 billable? +
Yes, B05.0 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 B05.0? +
ICD-10 B05.0 includes: Postmeasles encephalitis.
Is B05.0 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 B05.0? +
Procedures frequently paired with B05.0 include: 95929, 92651, 92653, 95928, 95930.
What ICD-9 codes does B05.0 map to? +
Per CMS GEMs, B05.0 maps to ICD-9 codes: 0550. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 2, 2026.
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