ICD-10-CM 2027 diagnosis code

B26Mumps

Not billable — use a more specific code

B26 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About B26

B26 is the ICD-10-CM diagnosis code for mumps. It belongs to block B25-B34 (other viral diseases) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: B26.0 (orchitis), B26.1 (meningitis), B26.2 (encephalitis), B26.3 (pancreatitis), B26.8 (with other complications) and B26.9 (without complication).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under B26

Coding notes

IncludesFurther defines the content of the category

epidemic parotitis
infectious parotitis

Notes that apply from higher levels

Instructions written at a parent level also apply to B26.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Codes whose notes reference B26

K11.2Excludes1
K11.2Excludes1

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about B26

Is B26 billable?: No. B26 is a header code. Report one of its more specific subcodes instead.