DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A74 Other diseases caused by chlamydiae

  • Header · not billable

A74 is not billable. The category heads 4 billable codes in FY2027, grouped under 3 subdivisions.

Index → code

  • Paratrachoma → A74.0
  • Chlamydia, chlamydial → A74.9
  • Disease, diseasedchlamydial → A74.9

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A70-A74 Other diseases caused by chlamydiae (A70-A74)
  3. A74 Other diseases caused by chlamydiae
Billable codes
4
Subdivisions
3
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
15

Codes in A74

  1. A74.0
    Chlamydial conjunctivitis
    Billable
    Inclusion terms 1

    Inclusion terms

    • Paratrachoma
  2. A74.8
    Other chlamydial diseases
    Header
  3. A74.81
    Chlamydial peritonitis
    Billable
  4. A74.89
    Other chlamydial diseases
    Billable
  5. A74.9
    Chlamydial infection, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Chlamydiosis NOS

Sources of each column.

Instructions

At A74

Excludes1

  • neonatal chlamydial conjunctivitis (P39.1) P39.1
  • neonatal chlamydial pneumonia (P23.1) P23.1
  • Reiter's disease (M02.3-) M02.3
  • sexually transmitted chlamydial diseases (A55-A56) A55 A56

Excludes2

  • chlamydial pneumonia (J16.0) J16.0

Notes that also apply

Block A70-A74 instructions (Excludes1 1): printed on the block page.

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

Index entries

  • Paratrachoma → A74.0
  • Chlamydia, chlamydial → A74.9
  • Chlamydia, chlamydialconjunctivitis → A74.0
  • Conjunctivitis (staphylococcal) (streptococcal) NOSchlamydial → A74.0
  • Conjunctivitis (staphylococcal) (streptococcal) NOSinclusion → A74.0
  • Chlamydia, chlamydialperitonitis → A74.81
  • Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion)chlamydial → A74.81
  • Chlamydia, chlamydialspecified NEC → A74.89
  • Disease, diseasedchlamydial → A74.9
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydial → A74.9
  • Conjunctivitis (staphylococcal) (streptococcal) NOSin (due to)Chlamydia → A74.0
  • Disease, diseasedconjunctivachlamydial → A74.0
  • Fitzhugh-Curtis syndromedue toChlamydia trachomatis → A74.81
  • Disease, diseasedchlamydialspecified NEC → A74.89
  • SyndromeFitzhugh-Curtisdue toChlamydia trachomatis → A74.81

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

Hierarchy