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    v1.0.28
    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g9638-imaging-dose-reduction-documentation-deficit
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    HCPCS G9638: Final Report Missing Dose Reduction Technique Documentation

    HCPCS Level II code G9638 denotes a final imaging report that documents absence of one or more dose reduction techniques (for example, automated exposure control, adjustment of mA and/or kV for patient size, or use of iterative reconstruction), representing a quality/compliance marker for diagnostic imaging services; the service type is imaging quality/documentation review and the typical site of service is radiology departments or outpatient imaging centers where CT or other dose-managed imaging studies are performed.

    For related coverage guidance, see recent payer policy updates: Esophagogastroduodenoscopy (EGD) Coverage Policy, Magnetic Sphincter Augmentation for the Treatment of Gastroesophageal Reflux Disease (GERD), Serum Testing for Hepatic Fibrosis in the Evaluation and Monitoring of Chronic Liver Disease.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 58-year-old male with a history of smoking and chronic cough presents to the emergency department with acute chest pain. The emergency physician orders a non-contrast chest CT to evaluate for pulmonary embolism and a contrast-enhanced CT angiogram to assess the aorta. The CT technologist performs the studies but the final radiology report lacks documentation that dose-reduction techniques were used (for example, automated exposure control, adjustment of mA and/or kV for patient size, or use of iterative reconstruction). Billing staff apply HCPCS Level II code G9638 to indicate a final report was produced without documented use of one or more dose reduction strategies. Typical workflow: imaging order → pre-scan assessment (height/weight, clinical indication) → CT acquisition (protocol intended to use dose-reduction features) → image reconstruction → interpreting radiologist generates final report → coder assigns G9638 if report omits documentation of dose reduction techniques. Typical site of service is an acute care hospital or outpatient imaging center providing CT studies where radiation dose optimization is expected but not documented in the report.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    71260CT chest without contrast materialCommon CT acquisition that would be subject to dose-reduction documentation; often performed in similar clinical workflows.
    71275CT chest with contrast material, including non-contrast images when performed; with contrast-enhanced acquisitionPerformed when vascular evaluation is needed; dose optimization and documentation are relevant.
    70450CT head/brain without contrast materialAnother common CT study where dose-reduction techniques (kV/mA adjustments, iterative reconstruction) apply and documentation matters.
    74177CT abdomen and pelvis with contrastFrequently paired with chest CT in trauma or systemic evaluation; documentation of dose-reduction methods affects cumulative dose records.
    763763D rendering with interpretation (eg, CT)Post-processing services that may follow CT acquisition; distinction between technical and professional components can affect modifier use.
    92950Cardiopulmonary resuscitation (unrelated procedure example)Included to indicate unrelated emergency interventions that may affect imaging completion and modifier selection.

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    2086S0102XSurgical Critical Care PhysicianA surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critica…
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    363A00000XPhysician AssistantA physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and…
    2084N0400XNeurology PhysicianA Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, auton…
    1835X0200XOncology PharmacistA licensed pharmacist who has demonstrated specialized knowledge and skill in developing, recommending, implementing, monitoring, and modifying pharma…
    2080A0000XPediatric Adolescent Medicine PhysicianA pediatrician who specializes in adolescent medicine is a multi-disciplinary healthcare specialist trained in the unique physical, psychological and …
    2084P0005XNeurodevelopmental Disabilities PhysicianA neurologist who specializes in the treatment of individuals with developmental delays and learning disorders associated with cerebral palsy, spina b…
    163WD0400XDiabetes Educator Registered NurseNursing Service Providers · Registered Nurse

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C50.912Malignant neoplasm of unspecified site of left female breast
    C61Malignant neoplasm of prostate
    E11.9Type 2 diabetes mellitus without complications
    G47.33Obstructive sleep apnea (adult) (pediatric)
    G89.29Other chronic pain
    H25.9Unspecified age-related cataract
    H40.9Unspecified glaucoma
    I20.9Angina pectoris, unspecified
    I21.9Acute myocardial infarction, unspecified

    Showing 1–10 of 28

    Related Payer Policy Updates

    Specialty: Gastroenterology1 / 3

    10 rows

    PolicyPayerEffective Date
    Esophagogastroduodenoscopy (EGD) Coverage Policyevicore2026-11-05
    Magnetic Sphincter Augmentation for the Treatment of Gastroesophageal Reflux Disease (GERD)univerahealthcare2026-10-15
    Serum Testing for Hepatic Fibrosis in the Evaluation and Monitoring of Chronic Liver DiseaseOscar Health2026-10-01
    Fecal Analysis in the Diagnosis of Intestinal Dysbiosis and Fecal Microbiota Transplant TestingOscar Health2026-10-01
    Pancreatic Enzyme Testing for Acute PancreatitisOscar Health2026-10-01
    Helicobacter pylori TestingOscar Health2026-10-01
    Celiac Disease TestingOscar Health2026-10-01
    Laboratory Testing for the Diagnosis of Inflammatory Bowel DiseaseOscar Health2026-10-01
    Percutaneous Electrical Nerve Field Stimulation (PENFS)Cigna2026-09-15
    Colorectal Cancer ScreeningBlue Cross Blue Shield - New Mexico2026-09-04

    Related Codes

    HCPCS-G9490-HOME-ASSESSMENT-NON-HOMEBOUND

    HCPCS G9490: Home Visit Patient Assessment for Non-Homebound Beneficiary

    HCPCS-G0008-INFLUENZA-VACCINE-ADMINISTRATION

    HCPCS G0008: Administration of Influenza Virus Vaccine

    HCPCS-G0009-PNEUMOCOCCAL-VACCINE-ADMINISTRATION

    HCPCS G0009: Administration of Pneumococcal Vaccine

    HCPCS-G0010-HEPATITIS-B-VACCINE-ADMINISTRATION

    HCPCS G0010: Administration of Hepatitis B Vaccine

    HCPCS-G0011-PREP-COUNSELING-HIV-RISK-REDUCTION-ADHERENCE

    HCPCS G0011: Individual PrEP Counseling, HIV Risk Assessment

    HCPCS-G0012-PRE-EXPOSURE-PROPHYLAXIS-INJECTION-HIV-PREVENTION

    HCPCS G0012: Injection of PrEP Drug for HIV Prevention

    HCPCS-G0013-PREP-INDIVIDUAL-COUNSELING-HIV-RISK-REDUCTION

    HCPCS G0013: Individual PrEP Counseling by Clinical Staff

    HCPCS-G0017-PSYCHOTHERAPY-CRISIS-FIRST-60-MINUTES-NON-OFFICE

    HCPCS G0017: Psychotherapy for Crisis, First 60 Minutes

    HCPCS-G0018-PSYCHOTHERAPY-CRISIS-ADDITIONAL-30-MINUTES-NON-OFFICE

    HCPCS G0018: Psychotherapy for Crisis, Additional 30 Minutes

    HCPCS-G0019-COMMUNITY-HEALTH-INTEGRATION-SDOH-CARE-COORDINATION

    HCPCS G0019: Community Health Integration, Person-Centered Assessment

    Showing 1–10 of 1996

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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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