Other sexually transmitted chlamydial diseases
In Infections with a predominantly sexual mode of transmission (A50-A64), chapter 1: Certain Infectious and Parasitic Diseases
10 billable codes under A56: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- sexually transmitted diseases due to Chlamydia
- trachomatis
Excludes1: not coded here, use a different code
Also applies, from Infections with a predominantly sexual mode of transmission (A50-A64)
These notes sit on A50-A64 and apply to every code under it, including A56.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under A56
A56 can't be used on a claim. Pick a billable code below; grey headings group them.
- A56.0Chlamydial infection of lower genitourinary tract
- A56.00Chlamydial infection of lower genitourinary tract, unspecified
- A56.01Chlamydial cystitis and urethritis
- A56.02Chlamydial vulvovaginitis
- A56.09Other chlamydial infection of lower genitourinary tract
- A56.1Chlamydial infection of pelviperitoneum and other genitourinary organs
- A56.11Chlamydial female pelvic inflammatory disease
- A56.19Other chlamydial genitourinary infection
- A56.2Chlamydial infection of genitourinary tract, unspecified
- A56.3Chlamydial infection of anus and rectum
- A56.4Chlamydial infection of pharynx
- A56.8Sexually transmitted chlamydial infection of other sites
A56 MS-DRGs
As the principal diagnosis, the billable codes under A56 group to these 14 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 742 Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC (6 of 10 codes)
- DRG 743 Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC (6 of 10 codes)
- DRG 757 Infections, Female Reproductive System with MCC (6 of 10 codes)
- DRG 758 Infections, Female Reproductive System with CC (6 of 10 codes)
- DRG 759 Infections, Female Reproductive System without CC/MCC (6 of 10 codes)
- DRG 727 Inflammation of the Male Reproductive System with MCC (5 of 10 codes)
- DRG 728 Inflammation of the Male Reproductive System without MCC (5 of 10 codes)
- DRG 689 Kidney and Urinary Tract Infections with MCC (2 of 10 codes)
- DRG 690 Kidney and Urinary Tract Infections without MCC (2 of 10 codes)
- DRG 152 Otitis Media and URI with MCC (1 of 10 codes)
- DRG 153 Otitis Media and URI without MCC (1 of 10 codes)
- DRG 393 Other Digestive System Diagnoses with MCC (1 of 10 codes)
- DRG 394 Other Digestive System Diagnoses with CC (1 of 10 codes)
- DRG 395 Other Digestive System Diagnoses without CC/MCC (1 of 10 codes)
Other codes that refer to A56
Notes on these codes point to A56.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Chlamydia Infections
Chlamydia is a common sexually transmitted infection (STI). It is caused by bacteria called Chlamydia trachomatis. Anyone can get chlamydia. It often doesn't cause symptoms, so people may not know that they have it. Antibiotics can cure it. But if it's not treated, chlamydia can cause serious health problems.
Read more about chlamydia infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.