B26.9 ICD-10-CM Code: Mumps without complication
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other viral diseases (B25-B34)
B26.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceMumps without complication
Mumps is a viral infection that causes swelling of the salivary glands, typically in the cheeks and jaw area, without any serious complications.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Mumps NOS
- Mumps parotitis NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for B26.9 in this effective period.
Related Child Codes
Includes
Official- epidemic parotitis
- infectious parotitis
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for B26.9 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for B26.9 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for B26.9 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for B26.9 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is B26.9 an HCC code?
No. B26.9 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B26.9 is the ICD-10-CM diagnosis code for mumps without complication. Mumps is a viral infection that causes swelling of the salivary glands, typically in the cheeks and jaw area, without any serious complications. B26.9 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other viral diseases (b25-b34).
B26.9 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when mumps is confirmed without documented complications such as meningitis, encephalitis, or orchitis.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B26.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when mumps is confirmed without documented complications such as meningitis, encephalitis, or orchitis
- •If complications develop, use a more specific B26 code rather than B26.9