DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A56 Other sexually transmitted chlamydial diseases

  • Header · not billable

A56 is not billable. The category heads 10 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

  • Proctitischlamydial → A56.3
  • Chlamydia, chlamydialcystitis → A56.01
  • Chlamydia, chlamydialorchitis → A56.19

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A50-A64 Infections with a predominantly sexual mode of transmission (A50-A64)
  3. A56 Other sexually transmitted chlamydial diseases
Billable codes
10
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
37

Codes in A56

  1. A56.0
    Chlamydial infection of lower genitourinary tract
    Header
  2. A56.00
    Chlamydial infection of lower genitourinary tract, unspecified
    Billable
  3. A56.01
    Chlamydial cystitis and urethritis
    Billable
  4. A56.02
    Chlamydial vulvovaginitis
    Billable
  5. A56.09
    Other chlamydial infection of lower genitourinary tract
    Billable
    Inclusion terms 1

    Inclusion terms

    • Chlamydial cervicitis
  6. A56.1
    Chlamydial infection of pelviperitoneum and other genitourinary organs
    Header
  7. A56.11
    Chlamydial female pelvic inflammatory disease
    Billable
  8. A56.19
    Other chlamydial genitourinary infection
    Billable
    Inclusion terms 2

    Inclusion terms

    • Chlamydial epididymitis
    • Chlamydial orchitis
  9. A56.2
    Chlamydial infection of genitourinary tract, unspecified
    Billable
  10. A56.3
    Chlamydial infection of anus and rectum
    Billable
  11. A56.4
    Chlamydial infection of pharynx
    Billable
  12. A56.8
    Sexually transmitted chlamydial infection of other sites
    Billable

Sources of each column.

Instructions

At A56

Includes

  • sexually transmitted diseases due to Chlamydia
  • trachomatis

Excludes1

  • neonatal chlamydial conjunctivitis (P39.1) P39.1
  • neonatal chlamydial pneumonia (P23.1) P23.1

Excludes2

  • chlamydial lymphogranuloma (A55) A55
  • conditions classified to A74.- A74

Notes that also apply

Block A50-A64 instructions (Excludes1 2, Excludes2 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

  • Chlamydia, chlamydialcystitis → A56.01
  • Chlamydia, chlamydialurethritis → A56.01
  • Cystitis (exudative) (hemorrhagic) (septic) (suppurative)chlamydial → A56.01
  • Urethritis (anterior) (posterior)chlamydial → A56.01
  • Chlamydia, chlamydialvulvovaginitis → A56.02
  • Vaginitis (acute) (circumscribed) (diffuse) (emphysematous) (nonvenereal) (ulcerative)chlamydial → A56.02
  • Vulvitis (acute) (allergic) (atrophic) (hypertrophic) (intertriginous) (senile)chlamydial → A56.02
  • Cervicitis (acute) (atrophic) (chronic) (nonvenereal) (senile) (subacute) (with ulceration)chlamydial → A56.09
  • Chlamydia, chlamydialcervicitis → A56.09
  • Chlamydia, chlamydialendometritis → A56.11
  • Chlamydia, chlamydialsalpingitis → A56.11
  • Endometritis (decidual) (nonspecific) (purulent) (senile) (atrophic) (suppurative)chlamydial → A56.11
  • Salpingitis (catarrhal) (fallopian tube) (nodular) (pseudofollicular) (purulent) (septic)chlamydial → A56.11
  • Chlamydia, chlamydialepididymitis → A56.19
  • Chlamydia, chlamydialorchitis → A56.19
  • Epididymitis (acute) (nonvenereal) (recurrent) (residual)chlamydial → A56.19
  • Orchitis (gangrenous) (nonspecific) (septic) (suppurative)chlamydial → A56.19
  • Chlamydia, chlamydialproctitis → A56.3
  • Proctitischlamydial → A56.3
  • Chlamydia, chlamydialpharyngitis → A56.4
  • Pharyngitis (acute) (catarrhal)(gangrenous) (infective) (malignant) (membranous) (phlegmonous) (pseudomembranous) (simple) (subacute) (suppurative) (ulcerative)chlamydial → A56.4
  • Chlamydia, chlamydialsexually-transmitted infection NEC → A56.8
  • Chlamydia, chlamydialfemalepelvic inflammatory disease → A56.11
  • Chlamydia, chlamydialfemalepelviperitonitis → A56.11
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialgenitourinary tract → A56.2
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialanus → A56.3
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialrectum → A56.3
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialpharynx → A56.4
  • Disease, diseasedvenerealchlamydial NEC → A56.8
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialsexually transmitted NEC → A56.8
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialgenitourinary tractlower → A56.00
  • Disease, diseasedpelvis, pelvicinflammatory (female)chlamydial → A56.11
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydialgenitourinary tractspecified NEC → A56.19
  • Disease, diseasedvenerealchlamydial NECgenitourinary NOS → A56.2
  • Disease, diseasedvenerealchlamydial NECanus → A56.3
  • Disease, diseasedvenerealchlamydial NECrectum → A56.3
  • Disease, diseasedvenerealchlamydial NECpharynx → A56.4

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

Hierarchy