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    v1.0.30
    OpenPayerBilling CodesAdministrative, Miscellaneous and InvestigationalHCPCS hcpcs-a9277-transmitter-interstitial-cgm
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    HCPCS A9277: External Transmitter for Interstitial CGM System

    HCPCS Level II code A9277 describes an external transmitter component used with a non-durable medical equipment interstitial continuous glucose monitoring (CGM) system; this item represents the transmitter device that sends glucose sensor data and is classified as durable medical equipment accessory or supply typically provided with or to support a CGM system, with the service type being durable medical equipment supply and the typical site of service being outpatient, home health, or community-based settings where CGM devices are used.

    For related coverage guidance, see recent payer policy updates: Hospital Beds Corporate Medical Policy, Bone Growth Stimulators, Prior Authorization for Durable Medical Equipment (DME).

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult with insulin-treated diabetes mellitus (type 1 or insulin-requiring type 2) who is prescribed an interstitial continuous glucose monitoring (CGM) system that includes a disposable sensor, a non-durable external transmitter, and a receiver or smartphone app. The patient presents to an outpatient diabetes clinic or durable medical equipment (DME) supplier for transmitter replacement due to end of transmitter warranty, loss, damage, or routine device upgrade. Clinical workflow: clinician documents medical necessity (eg, need for ongoing glucose monitoring to manage insulin therapy), verifies prescription for the specific CGM system, obtains prior authorization if required by payer, and orders the external transmitter (A9277) from a contracted DME vendor. The vendor receives the order, confirms patient eligibility, bills the payer for the transmitter, and provides device education and pairing assistance with the patient’s receiver or smartphone during an outpatient visit or remote telehealth session. Typical site of service: outpatient clinic, DME supplier, or patient’s home during a home health or telehealth education session.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95249Ambulatory continuous glucose monitoring of interstitial tissue fluid via a continuous glucose sensor for > 72 hours; sensor placement, hook-up, calibration of monitor, patient training, initial interpretation and reportPerformed when placing the CGM sensor and initiating monitoring; clinician services that accompany transmitter setup
    95250Ambulatory continuous glucose monitoring of interstitial tissue fluid via a continuous glucose sensor for < 72 hours; sensor placement, hook-up, calibration of monitor, patient trainingUsed for shorter-duration CGM services or legacy systems where applicable
    95251Analysis, interpretation, and report of CGM data (minimum 72 hours)Used when professional interpretation of CGM data is billed separately from the supply of the transmitter
    99070Supplies and materials (eg, clinical) provided by the physician over and above those usually included with the serviceMay be used to report small bundled supplies or items related to device training when payer permits
    99406Smoking and tobacco use cessation counseling visit, intermediate, 3-10 minutesExample of an ancillary counseling service commonly billed during diabetes management visits; not specific to transmitter but part of comprehensive care

    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…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    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…
    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…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207Q00000X
    251S00000X
    363L00000X
    3336C0002X
    207K00000X
    364SC0200X
    208D00000X
    204E00000X

    Related ICD-10-CM Codes

    27 rows

    ICD-10-CM CodeDescription
    E10.10Type 1 diabetes mellitus with ketoacidosis without coma
    E10.21Type 1 diabetes mellitus with diabetic nephropathy
    E10.29Type 1 diabetes mellitus with other diabetic kidney complication
    E10.41Type 1 diabetes mellitus with diabetic mononeuropathy
    E10.65Type 1 diabetes mellitus with hyperglycemia
    E10.69Type 1 diabetes mellitus with other specified complication
    E10.8Type 1 diabetes mellitus with unspecified complications
    E10.9Type 1 diabetes mellitus without complications
    E11.10Type 2 diabetes mellitus with ketoacidosis without coma
    E11.21Type 2 diabetes mellitus with diabetic nephropathy

    Showing 1–10 of 27

    Related Payer Policy Updates

    Specialty: Durable Medical Equipment (DME)1 / 3

    10 rows

    PolicyPayerEffective Date
    Hospital Beds Corporate Medical Policybcbsvermont2027-01-01
    Bone Growth StimulatorsMass General Brigham Health Plan2026-12-01
    Prior Authorization for Durable Medical Equipment (DME)Blue Cross Blue Shield - Rhode Island2026-12-01
    Patient Liftsuniverahealthcare2026-11-16
    Medical Car SeatsCareSource2026-11-01
    Non-Invasive Home Mechanical Ventilation (E0466)CareSource2026-11-01
    Digestive Enzyme Cartridgeshusky_health2026-11-01
    Hearing Aids and Assistive Listening Devices for Children Enrolled in Birth-to-Threehusky_health2026-11-01
    Home Non-Invasive Positive Pressure Ventilation (NIPPV) Devices for Respiratory Insufficiency and Failureexcellus_health_plan_inc2026-10-15
    Prior Authorization for Durable Medical Equipment (DME)Blue Cross Blue Shield - Rhode Island2026-10-01

    Related Codes

    HCPCS-A9150-NON-PRESCRIPTION-DRUGS

    HCPCS Level II A9150: Non-prescription Drugs

    HCPCS-A9152-SINGLE-ORAL-VITAMIN-MINERAL-DOSE

    HCPCS A9152: Single Oral Vitamin/Mineral/Trace Element

    HCPCS-A9153-MULTIVITAMIN-ORAL-PER-DOSE

    HCPCS A9153: Multiple Vitamins, Oral, Per Dose

    HCPCS-A9154-ARTIFICIAL-SALIVA-1ML

    HCPCS Level II A9154: Artificial saliva, 1 ml

    HCPCS-A9155-ARTIFICIAL-SALIVA-30ML

    HCPCS Level II A9155: Artificial Saliva, 30 mL

    HCPCS-A9156-ORAL-MUCOADHESIVE-PER-1ML

    HCPCS Level II A9156: Oral Mucoadhesive, Per 1 ml

    HCPCS-A9180-PEDICULOSIS-TOPICAL-TREATMENT-PATIENT-ADMINISTRATION

    HCPCS Level II A9180: Pediculosis Topical Treatment for Patient/Caretaker

    HCPCS-A9268-PROGRAMMER-TRANSIENT-INGESTED-CAPSULE

    HCPCS Level II A9268: Programmer for Transient Orally Ingested Capsule

    HCPCS-A9269-PROGRAMMABLE-TRANSIENT-ORAL-CAPSULE

    HCPCS Level II A9269: Programmable Orally Ingested Capsule, Per Month

    HCPCS-A9270-NON-COVERED-ITEM-OR-SERVICE

    HCPCS A9270: Non-covered Item or Service

    Showing 1–10 of 138

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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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