Mumps (B26) ICD-10-CM
The B26 code range covers mumps with 13 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- epidemic parotitis
- infectious parotitis
Codes in the B26 Range 13 codes · 11 billable
- B26 MumpsNon-billable
- B26.0 Mumps orchitis
- B26.1 Mumps meningitis
- B26.2 Mumps encephalitis
- B26.3 Mumps pancreatitis
- B26.8 Mumps with other complicationsNon-billable
- B26.81 Mumps hepatitis
- B26.82 Mumps myocarditis
- B26.83 Mumps nephritis
- B26.84 Mumps polyneuropathy
- B26.85 Mumps arthritis
- B26.89 Other mumps complications
- B26.9 Mumps without complication
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B26 range.
Measles-Mumps-Rubella Vaccine
A combined vaccine used to prevent MEASLES; MUMPS; and RUBELLA.
Mumps
An acute infectious disease caused by RUBULAVIRUS, spread by direct contact, airborne droplet nuclei, fomites contaminated by infectious saliva, and perhaps urine, and usually seen in children under the age of 15, although adults may also be affected. (From Dorland, 28th ed)
Mumps Vaccine
Vaccines used to prevent infection by MUMPS VIRUS. Best known is the live attenuated virus vaccine of chick embryo origin, used for routine immunization of children and for immunization of adolescents and adults who have not had mumps or been immunized with live mumps vaccine. Children are usually immunized with measles-mumps-rubella combination vaccine.
Mumps virus
The type species of RUBULAVIRUS that causes an acute infectious disease in humans, affecting mainly children. Transmission occurs by droplet infection.
Parotitis
INFLAMMATION of the PAROTID GLAND.
Rubulavirus
A genus of the family PARAMYXOVIRIDAE (subfamily PARAMYXOVIRINAE) where all the species have hemagglutinin and neuraminidase activities but lack a C protein. MUMPS VIRUS is the type species.
Viral Fusion Proteins
Proteins, usually glycoproteins, found in the viral envelopes of a variety of viruses. They promote cell membrane fusion and thereby may function in the uptake of the virus by cells.
About the B26 Code Range
The ICD-10 code for mumps is B26, covering the viral infection known as mumps and its various complications. These codes help specify whether the infection is uncomplicated or involves particular organs or conditions.
The base code B26 represents mumps generally, while detailed codes like B26.0 identify mumps orchitis (also called infective orchitis), inflammation of the testes caused by the mumps virus. B26.1 and B26.2 correspond to neurological complications such as mumps meningitis and mumps encephalitis (including meningoencephalitis), resulting from Paramyxovirus infection. Other specified complications include mumps pancreatitis (B26.3), hepatitis (B26.81), myocarditis (B26.82), nephritis (B26.83), polyneuropathy (B26.84), and arthritis (B26.85). The code B26.89 covers less common complications like infectious sialoadenitis of salivary glands and oophoritis. Finally, B26.9 is used for mumps without complications, encompassing parotitis and sialadenitis of related glands. Using the correct code ensures precise classification of mumps cases and their specific manifestations.
Questions About This Page
How many billable codes are in the B26 range?
Of the 13 codes in this range, 11 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B26 range classify?
The range classifies mumps. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
