ICD-10-CM Code For Mumps: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B26 includes mumps infections and their specific manifestations, such as mumps orchitis, meningitis, encephalitis, pancreatitis, and unspecified mumps. These ICD-10-CM diagnosis codes are used to document acute viral infection with organ-specific involvement, capturing disease severity, complications, and clinical complexity relevant to mumps. Accurate coding within the ICD-10-CM B26 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM B26: Mumps Overview

The diagnoses in this group represent infections caused by the mumps virus, typically affecting the salivary glands and occasionally involving other organ systems. These conditions primarily target the parotid glands but can involve the central nervous system, testes, ovaries, pancreas, and other tissues. Accurate coding matters for reimbursement because it reflects disease complications and guides claim adjudication and clinical documentation completeness.

When to Use

Use codes from this group when a clinical diagnosis of mumps or a documented mumps-related complication is present and supported in the medical record. Select the code that reflects the specific organ involvement or complication to capture clinical complexity and support claims.

ICD-10-CM Codes

11 rows

ICD-10-CM Code	Description
B26.0	Mumps orchitis
B26.1	Mumps meningitis
B26.2	Mumps encephalitis
B26.3	Mumps pancreatitis
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

DRG Codes

21 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
024	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
073	Cranial and Peripheral Nerve Disorders with MCC
074	Cranial and Peripheral Nerve Disorders without MCC
075	Viral Meningitis with CC/MCC
076	Viral Meningitis without CC/MCC
097	Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
098	Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
099	Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC
438	Disorders of Pancreas Except Malignancy with MCC
439	Disorders of Pancreas Except Malignancy with CC
440	Disorders of Pancreas Except Malignancy without CC/MCC
441	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC
442	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC
443	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC
727	Inflammation of the Male Reproductive System with MCC
728	Inflammation of the Male Reproductive System without MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems
865	Viral Illness with MCC

Showing 1–20 of 21

Typical Clinical Scenarios

A previously healthy school-aged child presents to the pediatric urgent care with 48 hours of fever, malaise, and painful unilateral parotid gland swelling and tenderness; the clinician documents viral parotitis consistent with acute mumps and orders supportive care and isolation. A diagnosis from this group is assigned to capture acute mumps parotitis as the primary illness. Typical codes: B26.0.
An adolescent male is evaluated in the emergency department for sudden onset severe testicular pain and swelling three days after a confirmed viral prodrome; exam and ultrasound are consistent with orchitis caused by mumps, prompting pain control, scrotal support, and urology consultation. A code from this group is used to indicate mumps-associated orchitis as a complication of the infection. Typical codes: B26.1.
An adult patient hospitalized for encephalitis presents after several days of fever and altered mental status and is found to have laboratory evidence of mumps virus; the team documents meningoencephalitis related to mumps requiring inpatient supportive care and monitoring. A code from this group is assigned to capture mumps involvement of the central nervous system as a severe complication. Typical codes: B26.2, B26.89.

Related Codes

B25-CYTOMEGALOVIRAL-DISEASE

ICD-10-CM Code For Cytomegaloviral Disease: Group Overview

B27-INFECTIOUS-MONONUCLEOSIS

ICD-10-CM Code For Infectious Mononucleosis: Group Overview

B30-VIRAL-CONJUNCTIVITIS

ICD-10-CM Code For Viral Conjunctivitis: Group Overview

B33-OTHER-VIRAL-DISEASES-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Other Viral Diseases Not Elsewhere Classified: Group Overview

B34-VIRAL-INFECTION-OF-UNSPECIFIED-SITE

ICD-10-CM Code For Viral Infection Of Unspecified Site: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

11 rows

ICD-10-CM Code	Description
B26.0	Mumps orchitis
B26.1	Mumps meningitis
B26.2	Mumps encephalitis
B26.3	Mumps pancreatitis
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

DRG Codes

21 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
024	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
073	Cranial and Peripheral Nerve Disorders with MCC
074	Cranial and Peripheral Nerve Disorders without MCC
075	Viral Meningitis with CC/MCC
076	Viral Meningitis without CC/MCC
097	Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
098	Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
099	Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC
438	Disorders of Pancreas Except Malignancy with MCC
439	Disorders of Pancreas Except Malignancy with CC
440	Disorders of Pancreas Except Malignancy without CC/MCC
441	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC
442	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC
443	Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC
727	Inflammation of the Male Reproductive System with MCC
728	Inflammation of the Male Reproductive System without MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems
865	Viral Illness with MCC

Showing 1–20 of 21

Typical Clinical Scenarios

A previously healthy school-aged child presents to the pediatric urgent care with 48 hours of fever, malaise, and painful unilateral parotid gland swelling and tenderness; the clinician documents viral parotitis consistent with acute mumps and orders supportive care and isolation. A diagnosis from this group is assigned to capture acute mumps parotitis as the primary illness. Typical codes: B26.0.
An adolescent male is evaluated in the emergency department for sudden onset severe testicular pain and swelling three days after a confirmed viral prodrome; exam and ultrasound are consistent with orchitis caused by mumps, prompting pain control, scrotal support, and urology consultation. A code from this group is used to indicate mumps-associated orchitis as a complication of the infection. Typical codes: B26.1.
An adult patient hospitalized for encephalitis presents after several days of fever and altered mental status and is found to have laboratory evidence of mumps virus; the team documents meningoencephalitis related to mumps requiring inpatient supportive care and monitoring. A code from this group is assigned to capture mumps involvement of the central nervous system as a severe complication. Typical codes: B26.2, B26.89.

Related Codes

B25-CYTOMEGALOVIRAL-DISEASE

ICD-10-CM Code For Cytomegaloviral Disease: Group Overview

B27-INFECTIOUS-MONONUCLEOSIS

ICD-10-CM Code For Infectious Mononucleosis: Group Overview

B30-VIRAL-CONJUNCTIVITIS

ICD-10-CM Code For Viral Conjunctivitis: Group Overview

B33-OTHER-VIRAL-DISEASES-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Other Viral Diseases Not Elsewhere Classified: Group Overview

B34-VIRAL-INFECTION-OF-UNSPECIFIED-SITE

ICD-10-CM Code For Viral Infection Of Unspecified Site: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Mumps: Group Overview

Sign up for ICD-10-CM Code For Mumps: Group Overview policy alerts

ICD-10-CM B26: Mumps Overview

ICD-10-CM Code For Mumps: Group Overview

Sign up for ICD-10-CM Code For Mumps: Group Overview policy alerts

ICD-10-CM B26: Mumps Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the B26 group for mumps?

How does accurate coding within the `B26` group affect reimbursement?

Which DRGs may be related to admissions for mumps complications listed in B26?

What types of organ involvement are represented by the `B26` codes?

When should a coder select `B26.9` versus another `B26` code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the B26 group for mumps?

How does accurate coding within the `B26` group affect reimbursement?

Which DRGs may be related to admissions for mumps complications listed in B26?

What types of organ involvement are represented by the `B26` codes?

When should a coder select `B26.9` versus another `B26` code?

References