Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.30
    OpenPayerBilling CodesInfections with a predominantly sexual mode of transmissionICD-10-CM a64-unspecified-sexually-transmitted-disease
    Ask Trek AI about this page

    ICD-10-CM Code For Unspecified Sexually Transmitted Disease: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A64 includes diagnoses for sexually transmitted infections when the specific pathogen or disease is not identified, covering non-specific genital infections and undifferentiated sexually transmitted conditions. These ICD-10-CM diagnosis codes are used to document clinical encounters where organism identification is pending, unavailable, or not recorded, capturing disease presentation and diagnostic uncertainty relevant to this group. Accurate coding within the ICD-10-CM A64 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Unspecified Sexually Transmitted Disease: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM A64: Unspecified Sexually Transmitted Disease Overview

    This group represents diagnoses used when a sexually transmitted infection is identified but the causative organism or specific disease is not specified. These conditions affect the genitourinary and reproductive systems and can include a range of clinical presentations from asymptomatic infection to symptomatic mucosal disease. Accurate coding is important for complete clinical documentation and can affect claim adjudication and reimbursement.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • Facility ComparisonBeds, revenue & payer mix
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when the clinical record documents a sexually transmitted infection without a specified etiologic agent or when testing has not identified a cause. These codes apply when documentation reflects diagnostic uncertainty or incomplete workup that prevents assignment of a more specific code.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    A64Unspecified sexually transmitted disease

    DRG Codes

    7 rows

    DRG CodeDescription
    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 young adult presents to an urgent care clinic with new-onset genital itching and mucopurulent discharge after recent unprotected sexual activity; laboratory testing is inconclusive or pending and no specific pathogen is identified at the time of visit. The clinician documents an unspecified sexually transmitted infection when empiric counseling and symptomatic treatment are initiated because a definitive etiology has not been established. Typical codes: A64.
    • A middle-aged patient with persistent genital symptoms has had multiple outpatient evaluations and empiric treatments over several months, but repeated testing (including nucleic acid amplification tests and cultures) fails to identify a causative organism; the clinician records an unspecified sexually transmitted disease as the working diagnosis for ongoing management. This code is used to capture an unresolved STI diagnosis when specific organism-level coding is not supported by available clinical data. Typical codes: A64.
    • An individual is evaluated in the emergency department for pelvic pain and fever following recent sexual exposure; initial workup rules out acute surgical causes and specific STI test results are unavailable at discharge, so an unspecified sexually transmitted infection is listed as a comorbid diagnosis to indicate a possible infectious etiology contributing to the presentation. This allows documentation of the suspected sexually transmitted source when definitive identification is not achieved during the acute visit. Typical codes: A64.

    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

    A56-OTHER-SEXUALLY-TRANSMITTED-CHLAMYDIAL-DISEASES

    ICD-10-CM Code For Other Sexually Transmitted Chlamydial Diseases: 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

    Showing 1–10 of 12

    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.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.