B05.1 — Measles complicated by meningitis
Is B05.1 billable?
Yes — B05.1 is billable for FY2027. B05.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. B05.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
B05.1 at a glance
| Code | B05.1 |
|---|---|
| Description | Measles complicated by meningitis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does B05.1 group to?
B05.1 sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 791Prematurity with Major Problemsmedical
As a secondary diagnosis, B05.1 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is B05.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to B05.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Meningitis › postmeasles (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
- Measles › with › meningitis (black) (hemorrhagic) (suppressed)
- Meningitis › in › measles (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
Inclusion terms
Alternative wording in documentation that is classified to B05.1.
- Postmeasles meningitis
Excludes1 — never code together — inherited from B05
The conditions below can never be reported together with B05.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- subacute sclerosing panencephalitis (A81.1)
Use additional code — inherited from Chapter 1
Report an additional code alongside B05.1 to fully describe the condition. B05.1 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of B05.1, but a patient may have both at the same time. When documentation supports it, B05.1 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
How long has B05.1 existed?
B05.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with B05.1?
ICD-10-CM declares these codes mutually exclusive with B05.1 — exactly one of each pair can be correct for a given encounter.