2027 ICD-10-CM Diagnosis Code B06.01Rubella encephalitis
ICD-10-CM Codes›A00–B99›B00-B09›B06
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
B06.01 is a billable ICD-10-CM diagnosis code for rubella encephalitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 97 through 99, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 24 closely related codes. Coders also document this condition as meningitis caused by Rubella virus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Encephalitis and Viral infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Meningitis caused by Rubella virus
- Meningoencephalitis caused by Rubella virus
- Meningoencephalitis caused by virus
- Progressive rubella panencephalitis
- Rubella encephalitis
- Rubella infection of central nervous system
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B06.01: its own notes plus those printed at B06 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Rubella meningoencephalitis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B06.01, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming B06.01: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) G04.90
rubella B06.01
Encephalomyelitis See Also: Encephalitis; G04.90
rubella B06.01
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Encephalitis
Encephalitis is inflammation (swelling) of the brain. It can happen when an infection or medical condition that affects the brain activates your immune system. The inflammation can cause a wide range of symptoms. In extreme cases, it can lead to brain damage, stroke, or even death.
The full article covers:
- What is encephalitis?
- What causes encephalitis?
- Who is more likely to get encephalitis?
- What are the symptoms of encephalitis?
- How is encephalitis diagnosed?
- What are the treatments for encephalitis?
- Can encephalitis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B06.01 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B06.01Overview
What is the ICD-10 code for rubella encephalitis?
The ICD-10-CM code for rubella encephalitis is B06.01 (sometimes written as B0601). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B06.01 (Rubella with neurological complications) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rubella encephalitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B06.01 group to?
When rubella encephalitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 98, 99, 97, with relative weights from 1.5249 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B06.01 a CC or MCC?
CMS lists B06.01 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 24 closely related codes in its exclusion list.
Can B06.01 be reported with P35.0?
Not as a rule. The Excludes1 note at B06, which applies to B06.01, lists "congenital rubella (P35.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
