DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 1

B25-B34 Other viral diseases (B25-B34)

Block B25-B34 groups 6 categories with 55 billable codes in FY2027.

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. B25-B34 Other viral diseases (B25-B34)

Neighbouring blocks

Categories
6
Billable codes
55
CC codes
18
MCC codes
4
HCC V28 codes
7
New FY2027
0

Categories in B25-B34

  • B25

    Cytomegaloviral disease

    Cytomegalovirus infection → B25.9

    • 5 billable codes
    • 3 CC
    • 2 MCC
    • 5 with HCC
  • B26

    Mumps

    Mumps → B26.9

    • 11 billable codes
    • 8 CC
    • 2 MCC
    • 1 with HCC
  • B27

    Infectious mononucleosis

    Mononucleosis, infectious → B27.90

    • 16 billable codes
  • B30

    Viral conjunctivitis

    Shipyard disease or eye → B30.0

    • 6 billable codes
  • B33

    Other viral diseases, not elsewhere classified

    Tahyna fever → B33.8

    • 10 billable codes
    • 6 CC
    • 1 with HCC
  • B34

    Viral infection of unspecified site

    Viremia → B34.9

    • 7 billable codes
    • 1 CC

Index main terms

  • Disease, diseased → B25, B30, B33, B34 (29 entries)
  • Infection, infected, infective (opportunistic) → B25, B27, B33, B34 (23 entries)
  • Mononucleosis, infectious → B27 (20 entries)
  • Conjunctivitis (staphylococcal) (streptococcal) NOS → B30 (18 entries)
  • Mumps → B26 (12 entries)
  • Coxsackie (virus) (infection) → B33, B34 (7 entries)
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) → B26, B33 (6 entries)
  • Hepatitis → B25, B26, B33 (4 entries)
  • Keratoconjunctivitis → B30 (4 entries)
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) → B30, B33 (3 entries)
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) → B25 (3 entries)
  • Adenitis → B27 (2 entries)
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) → B26, B34 (2 entries)
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) → B25, B26 (2 entries)
  • Grip → B33 (2 entries)

+41 more main terms; the search box finds them by word.

Block instructions

Notes that also apply

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