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    OpenPayerBilling CodesInfections with a predominantly sexual mode of transmissionICD-10-CM a56-other-sexually-transmitted-chlamydial-diseases
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    ICD-10-CM Code For Other Sexually Transmitted Chlamydial Diseases: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A56 includes chlamydial infections acquired through sexual transmission that involve sites such as the rectum, pharynx, conjunctiva, and other specified anatomic locations beyond simple urethral infection. These ICD-10-CM diagnosis codes are used to document clinical presentations of chlamydial infection with specific site involvement, complications, or atypical manifestations that affect treatment and follow-up. Accurate coding within the ICD-10-CM A56 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A56: Other Sexually Transmitted Chlamydial Diseases Overview

    The ICD-10-CM A56 group represents chlamydial infections transmitted primarily through sexual contact that affect sites beyond uncomplicated urogenital infection, such as the rectum, pharynx, conjunctiva, or other specified anatomic locations. These diagnoses target infectious processes caused by Chlamydia species and related clinical manifestations in mucosal tissues. Accurate coding matters for correct clinical records and supports appropriate reimbursement by reflecting the specific site and complexity of infection.

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    When to Use

    Use a code from this group when a patient has a laboratory-confirmed or clinically diagnosed chlamydial infection at sites such as the rectum, pharynx, or conjunctiva, or when the provider documents an other specified sexually transmitted chlamydial disease. Select the code that reflects the exact anatomic site and any specified complications or manifestations noted in the clinical record.

    ICD-10-CM Codes

    10 rows

    ICD-10-CM CodeDescription
    A56.00Chlamydial infection of lower genitourinary tract, unspecified
    A56.01Chlamydial cystitis and urethritis
    A56.02Chlamydial vulvovaginitis
    A56.09Other chlamydial infection of lower genitourinary tract
    A56.11Chlamydial 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

    DRG Codes

    17 rows

    DRG CodeDescription
    011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC
    012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC
    013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC
    152Otitis Media and URI with MCC
    153Otitis Media and URI without MCC
    393Other Digestive System Diagnoses with MCC
    394Other Digestive System Diagnoses with CC
    395Other Digestive System Diagnoses without CC/MCC
    689Kidney and Urinary Tract Infections with MCC
    690Kidney and Urinary Tract Infections without MCC
    727Inflammation of the Male Reproductive System with MCC
    728Inflammation of the Male Reproductive System without MCC
    742Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC
    743Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC
    757Infections, Female Reproductive System with MCC
    758Infections, Female Reproductive System with CC
    759Infections, Female Reproductive System without CC/MCC

    Typical Clinical Scenarios

    • A sexually active young adult presents to urgent care with acute onset of purulent urethral discharge, dysuria, and recent unprotected intercourse. A nucleic acid amplification test (NAAT) from a urine specimen returns positive for Chlamydia trachomatis, and there is no evidence of pelvic inflammatory disease or prostatitis. A diagnosis from this group is assigned for an acute uncomplicated chlamydial infection of the male urethra. Typical codes: A56.00, A56.01
    • A reproductive-age woman reports persistent vaginal discharge and intermenstrual bleeding; pelvic exam reveals cervicitis with a positive cervical NAAT for Chlamydia trachomatis. The patient has had recurrent episodes over months despite prior treatment, consistent with chronic or recurrent chlamydial cervicitis. A code from this group is used to classify her chronic lower genital tract chlamydial infection. Typical codes: A56.11, A56.19
    • A patient presents to the emergency department with fever, lower abdominal pain, and cervical motion tenderness; ultrasound and clinical findings support pelvic inflammatory disease (PID) secondary to chlamydial infection. Because the chlamydial infection has ascended and caused a complication of the upper genital tract, a more specific code for chlamydial involvement of the pelvis is assigned. Typical codes: A56.3, A56.4

    Related Codes

    A50-CONGENITAL-SYPHILIS

    ICD-10-CM Code For Congenital Syphilis: Group Overview

    A51-EARLY-SYPHILIS

    ICD-10-CM Code For Early Syphilis: Group Overview

    A52-LATE-SYPHILIS

    ICD-10-CM Code For Late Syphilis: Group Overview

    A53-OTHER-AND-UNSPECIFIED-SYPHILIS

    ICD-10-CM Code For Other And Unspecified Syphilis: Group Overview

    A54-GONOCOCCAL-INFECTION

    ICD-10-CM Code For Gonococcal Infection: Group Overview

    A55-CHLAMYDIAL-LYMPHOGRANULOMA-VENEREUM

    ICD-10-CM Code For Chlamydial Lymphogranuloma (Venereum): Group Overview

    A57-CHANCROID

    ICD-10-CM Code For Chancroid: Group Overview

    A58-GRANULOMA-INGUINALE

    ICD-10-CM Code For Granuloma Inguinale: Group Overview

    A59-TRICHOMONIASIS

    ICD-10-CM Code For Trichomoniasis: Group Overview

    A60-ANOGENITAL-HERPESVIRAL-INFECTIONS

    ICD-10-CM Code For Anogenital Herpesviral Infections: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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