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    v1.0.30
    OpenPayerBilling CodesEndoscopy Procedures on the AnusCPT cpt-46604-anoscopy-with-anal-dilation
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    CPT 46604: Anoscopy with Anal Dilation

    Medicare pays $723 on average nationally for this procedure.

    CPT code 46604 describes an anoscopy with dilation of the anal canal using a balloon, guidewire, or bougie; this procedure is an endoscopic anorectal intervention performed to inspect the anus and mechanically treat narrowing, typically classified as a diagnostic and therapeutic proctologic procedure and commonly performed in an ambulatory surgery center or clinic procedure room under appropriate anesthesia or sedation.

    For related coverage guidance, see recent payer policy updates: Surgical Procedures, Outpatient Surgical Procedures - Site of Service, Site of Service Ambulatory Service Center (ASC) Select — Surgical or Diagnostic Procedures in Adults.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult presenting to an outpatient colorectal clinic or gastroenterology office with symptoms of anorectal pain, bleeding, difficulty with defecation, or a history of anal stenosis following hemorrhoidectomy or radiation. The provider performs an anoscopy using a small rigid anoscope to directly visualize the anal canal and distal rectum. If a stricture or narrowing is identified, the provider mechanically dilates the anal canal using a bougie, balloon dilator, or guidewire-assisted technique under direct visualization. Local anesthesia or topical anesthetic may be applied; conscious sedation is uncommon but may be used for patient comfort. The workflow includes pre-procedure assessment and consent, position the patient in left lateral or prone jackknife position, perform anoscopy and inspection, therapeutically dilate any identified narrowing, document findings and dilation method, provide postprocedure instructions, and arrange follow-up care. Typical sites of service are outpatient clinic, ambulatory surgery center, or hospital outpatient department depending on patient comorbidities and need for sedation.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    46600Inspection of anus and/or perianal area; anoscopy, without dilationDiagnostic anoscopy-only code when no dilation is performed; often performed prior to 46604.
    45378Colonoscopy, flexible, proximal to splenic flexure; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate code for screening/diagnostic)Performed if pathology extends beyond the reach of anoscopy and a full lower GI evaluation is indicated.
    46040Closure of anorectal fistula; simplePerformed for anorectal disease management that may follow diagnostic anoscopy findings.
    46940Anal sphincterotomy (internal), for anal fissureSurgical treatment for fissures identified during anoscopy that may be performed subsequently.
    99152Moderate sedation services provided by the same physician performing the diagnostic or therapeutic service, initial 30 minutesBilled when conscious sedation is administered by the same physician during an anoscopy with dilation (use appropriate time-based sedation codes).

    Related Modifiers

    12 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…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
    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…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    79Modifier 79 indicates a surgical procedure performed during the postoperative global period of a prior surgery that is unrelated to the original procedure. Per AMA/CPT and CMS guidance, it is…- Use modifier 79 when the same physician (or same‑specialty physician in the same group) performs a surgical procedure during the postoperative global period of a prior surgery and the new procedure…
    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…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…

    Showing 1–10 of 12

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207K00000X
    207L00000X
    207RI0200X
    207ZC0008X
    207UN0901X
    207RI0011X
    207KA0200X
    163WU0100X

    Related Payer Policy Updates

    Specialty: General Surgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Surgical ProceduresUnitedHealthcare2026-09-01
    Outpatient Surgical Procedures - Site of ServiceUnitedHealthcare2026-09-01
    Site of Service Ambulatory Service Center (ASC) Select — Surgical or Diagnostic Procedures in AdultsPremera Bluecross2026-09-01
    Site of Service Ambulatory Surgical Center (ASC) Select — Surgical or Diagnostic Procedures in AdultsPremera Bluecross2026-09-01
    Site of Service Ambulatory Service Center (ASC) SelectPremera Bluecross2026-09-01
    Site of Service Ambulatory Surgical Center (ASC) Select — Site of Service for Ambulatory Surgical Procedures (ASC Select)Premera Bluecross2026-09-01
    Site of Service Ambulatory Service Center (ASC) SelectPremera Bluecross2026-09-01
    Outpatient Surgical Procedures - Site of Servicesierra health and life2026-08-01
    Medical Necessity Guidelines — Inpatient Surgical CareMass General Brigham Health Plan2026-08-01
    Ambulatory Surgery Center (ASC) - Site of Care PolicyKaiser Permanente2026-08-01

    Related Codes

    CPT-46600-ANOSCOPY-WITH-ANAL-CANAL-SAMPLING

    CPT 46600: Anoscopy with Anal Canal Specimen Collection

    CPT-46601-DIAGNOSTIC-ANOSCOPY-ENHANCED-VISUALIZATION

    CPT 46601: Diagnostic Anoscopy with Enhanced Visualization

    CPT-46606-ANOSCOPY-WITH-BIOPSY

    CPT 46606: Anoscopy with Biopsy, Anal Canal Tissue Sampling

    CPT-46607-ANOSCOPY-WITH-MAGNIFICATION-CHEMICAL-ENHANCEMENT-BIOPSY

    CPT 46607: Anoscopy with High-Resolution Magnification and Biopsy

    CPT-46608-ANOSCOPY-WITH-ANAL-FOREIGN-BODY-REMOVAL

    CPT 46608: Anoscopy with Removal of Anal Foreign Body

    CPT-46610-ANOSCOPY-SINGLE-LESION-REMOVAL-HOT-BIOPSY-BIPOLAR-CAUTERY

    CPT 46610: Anoscopy with Removal of Single Lesion

    CPT-46611-ANOSCOPY-SNARE-POLYPECTOMY

    CPT 46611: Anoscopy with Removal of Single Polyp/Tumor

    CPT-46612-ANOSCOPY-MULTIPLE-LESION-REMOVAL

    CPT 46612: Anoscopy with Removal of Multiple Lesions

    CPT-46614-ANOSCOPY-WITH-HEMOSTASIS

    CPT 46614: Anoscopy with Control of Bleeding

    CPT-46615-ANOSCOPY-LESION-EXCISION

    CPT 46615: Anoscopy with Excision of Anorectal Lesion

    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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