DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 1

A70-A74 Other diseases caused by chlamydiae (A70-A74)

Block A70-A74 groups 3 categories with 8 billable codes in FY2027.

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A70-A74 Other diseases caused by chlamydiae (A70-A74)

Neighbouring blocks

Categories
3
Billable codes
8
CC codes
1
MCC codes
0
HCC V28 codes
0
New FY2027
0

Categories in A70-A74

  • A70

    Chlamydia psittaci infections

    Ornithosis → A70

    • Billable, no subdivisions
    • 1 CC
  • A71

    Trachoma

    Trachoma, trachomatous → A71.9

    • 3 billable codes
  • A74

    Other diseases caused by chlamydiae

    Paratrachoma → A74.0

    • 4 billable codes

Index main terms

  • Conjunctivitis (staphylococcal) (streptococcal) NOS → A71, A74 (7 entries)
  • Trachoma, trachomatous → A71 (6 entries)
  • Chlamydia, chlamydial → A70, A74 (5 entries)
  • Disease, diseased → A74 (3 entries)
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) → A70 (3 entries)
  • Infection, infected, infective (opportunistic) → A70, A74 (2 entries)
  • Contraction(s), contracture, contracted → A71 (1 entry)
  • Dacryocystitis → A71 (1 entry)
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) → A70 (1 entry)
  • Fitzhugh-Curtis syndrome → A74 (1 entry)
  • Keratitis (nodular) (nonulcerative) (simple) (zonular) → A71 (1 entry)
  • Ophthalmia → A71 (1 entry)
  • Ornithosis → A70 (1 entry)
  • Pannus (allergic) (cornea) (degenerativus) (keratic) → A71 (1 entry)
  • Paratrachoma → A74 (1 entry)

+4 more main terms; the search box finds them by word.

Block instructions

Excludes1

  • sexually transmitted chlamydial diseases (A55-A56) A55 A56

Notes that also apply

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