95250

Ambulatory Continuous Glucose Monitoring (CGM), Professional Placement and Equipment

Ambulatory continuous glucose monitoring (CGM) is a diagnostic procedure utilized to provide a comprehensive record of a patient's glucose levels over an extended period, typically ranging from 3 to 14 days. CPT code 95250 specifically describes the professional service where the medical office or facility provides the monitoring equipment to the patient. This is distinct from patient-owned personal CGM devices. The procedure involves the subcutaneous placement of a glucose sensor, which measures glucose concentrations in the interstitial fluid at regular intervals (usually every 5 to 15 minutes). This interstitial data acts as a proxy for blood glucose levels, capturing fluctuations that occur between traditional capillary fingerstick measurements. The service includes the provision of the sensor and transmitter by the practice, the physical insertion of the sensor by a qualified healthcare professional or trained staff, and the thorough education of the patient on device use, including calibration requirements and log-keeping. The monitoring period must last for a minimum of 72 hours to meet the billing requirements for 95250. During this time, the device records hundreds of data points, allowing for the identification of patterns such as nocturnal hypoglycemia, the dawn phenomenon, and post-prandial glycemic excursions. The procedure concludes with the patient returning to the office for sensor removal and the downloading of the stored data into a readable report or printout. This technical component is essential for clinicians to make data-driven adjustments to a patient's diabetes management plan, including insulin dosages, oral medications, and lifestyle interventions.

Clinical Indications

  • Type 1 Diabetes Mellitus for assessment of glycemic variability
  • Type 2 Diabetes Mellitus with inadequate glycemic control despite therapy
  • Recurrent unexplained hypoglycemia or hypoglycemic unawareness
  • Evaluation of the 'Dawn Phenomenon' or nocturnal glucose trends
  • Gestational Diabetes Mellitus requiring intensive monitoring
  • Evaluation of glycemic patterns prior to initiating an insulin pump
  • Assessment of the efficacy of recent changes in diabetes medication or dosage
  • Pediatric diabetes management where frequent fingersticks are challenging

Procedure Steps

  1. Select an appropriate insertion site (typically the abdomen or back of the upper arm) and cleanse with alcohol.
  2. Insert the subcutaneous glucose sensor using a manufacturer-specific applicator device.
  3. Attach the transmitter to the sensor and secure the assembly with medical-grade adhesive.
  4. Initialize the monitor and verify connection with the receiver or data logger.
  5. Educate the patient on sensor care, avoiding water submersion (unless specified), and how to enter calibration data if required.
  6. Instruct the patient to maintain a diary of food intake, exercise, and insulin administration during the monitoring period.
  7. Ensure the device remains in place for at least 72 hours of continuous recording.
  8. Remove the sensor and transmitter at the end of the monitoring period.
  9. Download the stored data from the transmitter/receiver into the practice's glucose management software.
  10. Generate a standardized printout of the glucose trends and statistics for clinician review.

Coding Guidelines

  • Code 95250 is used only when the equipment is provided by the physician or the office. For patient-owned equipment, use 95249.
  • A minimum of 72 hours of continuous glucose recording is required to report this code.
  • This code may be reported only once per month (every 30 days) per patient.
  • 95250 covers the technical component: sensor placement, hook-up, calibration, patient training, removal, and printout.
  • The interpretation of the data should be reported separately using CPT 95251.
  • Do not report 95250 in conjunction with 95249.
  • The service includes the cost of the disposable sensor and the use of the clinic's transmitter/receiver.
  • If the patient does not return the equipment or if less than 72 hours of data is captured, the code may not be billable or may require a modifier (e.g., -52) depending on payer policy.

Associated ICD-10 Codes