DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

B26 Mumps

  • Header · not billable

B26 is not billable. The category heads 11 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. B25-B34 Other viral diseases (B25-B34)
  3. B26 Mumps
Billable codes
11
Subdivisions
6
CC / MCC codes
8 / 2
HCC V28 codes
1
New FY2027
0
Index entries
23

Codes in B26

  1. B26.0
    Mumps orchitis
    BillableCC
  2. B26.1
    Mumps meningitis
    BillableMCC
  3. B26.2
    Mumps encephalitis
    BillableMCC
  4. B26.3
    Mumps pancreatitis
    BillableCC
  5. B26.8
    Mumps with other complications
    Header
  6. B26.81
    Mumps hepatitis
    BillableCC
  7. B26.82
    Mumps myocarditis
    BillableCC
  8. B26.83
    Mumps nephritis
    BillableCC
  9. B26.84
    Mumps polyneuropathy
    BillableCC
  10. B26.85
    Mumps arthritis
    BillableCC92
  11. B26.89
    Other mumps complications
    BillableCC
  12. B26.9
    Mumps without complication
    Billable
    Inclusion terms 2

    Inclusion terms

    • Mumps NOS
    • Mumps parotitis NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At B26

Includes

  • epidemic parotitis
  • infectious parotitis

Notes that also apply

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Mumps → B26.9
  • Mumpsorchitis → B26.0
  • Orchitis (gangrenous) (nonspecific) (septic) (suppurative)mumps → B26.0
  • Mumpsmeningitis (aseptic) → B26.1
  • Meningoencephalitismumps → B26.2
  • Mumpsencephalitis → B26.2
  • Mumpsmeningoencephalitis → B26.2
  • Mumpspancreatitis → B26.3
  • Pancreatitis (annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)mumps → B26.3
  • Mumpshepatitis → B26.81
  • Mumpsmyocarditis → B26.82
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)mumps → B26.82
  • Mumpspolyneuropathy → B26.84
  • Mumpsarthritis → B26.85
  • Mumpscomplication NEC → B26.89
  • Mumpsoophoritis → B26.89
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)in (due to)mumps (virus) → B26.1
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)in (due to)mumps → B26.2
  • Meningoencephalitisin (due to)mumps → B26.2
  • Hepatitisin (due to)mumps → B26.81
  • Disorder (of)glomerular (in)mumps → B26.83
  • Polyneuropathy (peripheral)in (due to)mumps → B26.84
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)in (due to)mumps → B26.85

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy