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    v1.0.30
    OpenPayerBilling CodesModerate (Conscious) SedationCPT cpt-99156-moderate-sedation-initial-15-minutes
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    CPT 99156: Moderate Sedation, Initial 15 Minutes

    Medicare pays $72 on average nationally for this procedure.

    CPT code 99156 describes a clinician, other than the proceduralist, administering medication to reduce consciousness without rendering the patient unconscious for patients aged five years and older; this represents an initial 15 minutes of intraservice moderate sedation provided typically in procedural or operative settings such as ambulatory surgery centers, endoscopy suites, or hospital procedure rooms where sedation support is needed separate from the clinician performing the diagnostic or therapeutic procedure.

    For related coverage guidance, see recent payer policy updates: Dental Anesthesia Services, Anesthesia Services for Interventional Pain Management Procedures in an Adult, General Anesthesia and Conscious Sedation Services.

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    Clinical & Coding Specifications

    Clinical Context

    A 45-year-old patient presents to an outpatient endoscopy suite for an elective colonoscopy under moderate sedation. The patient has a history of hypertension and well-controlled obstructive sleep apnea on CPAP. A credentialed anesthesia professional (nurse anesthetist or anesthesiologist) or other qualified healthcare professional, other than the endoscopist performing the colonoscopy, administers sedative medication to reduce consciousness but not render the patient unconscious. The intraservice time for the initial sedative administration period is 15 minutes and is documented from the time sedation begins until the defined endpoint for the first unit of service. Vital signs, airway status, drug dosing (including bolus and infusion details), and the patient’s responsiveness are recorded in the procedure note and anesthesia record. The provider documents medical necessity for moderate sedation separate from the endoscopist’s services. Typical sites of service include hospital outpatient departments, ambulatory surgical centers, and endoscopy suites. The service type is monitored moderate sedation (sedation services distinct from the diagnostic or therapeutic procedure).

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    99153Moderate sedation services provided by an independent trained observer (eg, monitoring) during a diagnostic or therapeutic service, initial 15 minutesOften reported when a separate trained observer provides monitoring of the sedated patient rather than the clinician administering the sedation; documents the monitoring role.
    00810Anesthesia for procedures on lower abdomen; not otherwise specified (example anesthesia code for endoscopic procedures may vary)Represents anesthesia services when deeper anesthesia is required; contrasts with moderate sedation reported by 99156.
    45378Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (example procedure)The diagnostic/therapeutic procedure performed by the endoscopist for which moderate sedation (99156) is provided by another qualified professional.
    00840Anesthesia for an upper GI endoscopic procedure (example general anesthesia codes vary by setting)Used when general anesthesia is provided instead of moderate sedation; indicates a different level of service and coding.
    99157Each additional 15 minutes of intraservice time for moderate sedation by a provider other than the performing practitionerUsed to bill sequential additional units of moderate sedation time beyond the initial 99156.
    00400Anesthesia for procedures on the integumentary system of the neck; examples of anesthesia codes for other procedures where sedation or anesthesia services may be billedCodes such as this represent anesthesia services for other body areas when sedation/anesthesia is required instead of moderate sedation; included as examples of alternative anesthesia reporting.

    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…
    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…
    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.,…
    47Modifier -47 (“Anesthesia by Surgeon”) is appended to a surgical or procedural CPT code when the surgeon personally provides regional or general anesthesia for the procedure. Use of -47 indicates the…- Use modifier -47 when the surgeon personally provides regional or general anesthesia during the surgical procedure (i.e., the surgeon administers the anesthesia in addition to performing the…
    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…
    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…
    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…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…

    Showing 1–10 of 12

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207P00000X
    363A00000X
    208D00000X
    207L00000X
    208000000X
    275N00000X
    246QL0901X
    261QE0800X

    Related Payer Policy Updates

    Specialty: Anesthesiology1 / 3

    10 rows

    PolicyPayerEffective Date
    Dental Anesthesia ServicesProvidence Health Plan2026-10-01
    Anesthesia Services for Interventional Pain Management Procedures in an AdultCigna2026-09-15
    General Anesthesia and Conscious Sedation ServicesUnitedHealthcare2026-09-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Elective Inpatient Services (for Idaho Only)UnitedHealthcare2026-06-01
    Sites of Servicepriority health2026-06-01
    Coverage for Ambulatory Surgery Unit (ASU)/Outpatient Facility and Anesthesia for Dental Servicesuniverahealthcare2026-05-21

    Related Codes

    CPT-99151-PEDIATRIC-MODERATE-SEDATION-INITIAL-15-MINUTES

    CPT 99151: Moderate Procedural Sedation for Child <5 Years

    CPT-99152-PROCEDURAL-SEDATION-INITIAL-15-MINUTES

    CPT 99152: Moderate (Conscious) Sedation, Initial 15 Minutes

    CPT-99153-MODERATE-SEDATION-BEYOND-INTRASERVICE-TIME

    CPT 99153: Moderate Sedation with Observer Monitoring

    CPT-99155-PEDIATRIC-PROCEDURAL-SEDATION-INITIAL-15-MINUTES

    CPT 99155: Pediatric Moderate Sedation Medication Administration

    CPT-99157-MODERATE-SEDATION-EXTENDED-MONITORING

    CPT 99157: Moderate Sedation Medication Administration and Monitoring

    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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