2026 ICD-10-CM Diagnosis Code B26.9Mumps without complication
ICD-10-CM Codes›A00–B99›B25-B34›B26
- Billable — Valid for Submission
- Not Chronic
B26.9 is a billable ICD-10-CM diagnosis code for mumps without complication. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 865 through 866. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infectious sialoadenitis of major salivary gland
- Infective sialoadenitis
- Mumps
- Mumps acute sialadenitis
- Mumps parotitis
- Mumps sublingual sialadenitis
- Parotitis
- Sialoadenitis of the sublingual gland
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Mumps NOS
- Mumps parotitis NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Mumps - B26.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Mumps
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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)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.Mumps|Epidemic Parotitis|Epidemic Parotitis
a contagious viral infection caused by the mumps virus. symptoms include swollen and tender parotid glands, fever, muscle aches and fatigue. due to vaccination programs, mumps has become a rare disease.Parotitis
inflammation of the parotid glands.Suppurative Parotitis
parotitis that is caused by a bacterial agent.
Patient EducationClinical
Mumps
Mumps is an illness caused by the mumps virus. It starts with:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B26.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B26.9Overview
Is B26.9 (Mumps) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report mumps without complication on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does B26.9 group to?
When mumps without complication is the principal diagnosis on an inpatient stay, it groups to MS-DRG 865, 866, with relative weights from 0.8696 to 1.4983 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of B26.9?
Under the General Equivalence Mappings, mumps without complication converts to ICD-9-CM 072.9 (mumps uncomplicated). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
