Overview
Endocrinology billing sits awkwardly between office visits, lab work, and durable medical equipment, and payers treat each differently. Continuous glucose monitors and insulin pumps carry coverage criteria that must be documented before the claim goes out, diabetes self-management training has its own referral and accreditation rules, and routine monitoring labs run into frequency limits fast. Most of the lost revenue here is technology and education services that were delivered but never billed correctly.
Why these claims get denied
The denial reasons we see most often in endocrinology, and what our pre-billing checks are built to catch.
- CGM interpretation billed more often than the payer's 30-day frequency limit allows
- Continuous glucose monitor supplied without documented coverage criteria met
- Insulin pump billed without the required trial, training, and follow-up documentation
- Diabetes self-management training billed without a physician referral on file
- A1c and lipid panels exceeding the payer's monitoring frequency limits
- Chronic conditions managed but coded without the specificity payers require
- E/M downcoded because medical decision-making across multiple endocrine conditions wasn't documented
A real claim from this specialty
The kind of claim we see every week in endocrinology, and the denial that usually follows it.
Sample claim · single date of serviceEndocrinology
99214 25Office visit, established patient$186.00
95251CGM interpretation and report$38.00
83036Hemoglobin A1c$28.00
Denied: 95251 exceeds frequency limit
How we resolved itA prior interpretation had been billed 22 days earlier, inside the payer's 30-day window. We rebilled once the interval cleared and corrected the scheduling template so follow-ups fall outside it.
What we do for your practice
- CGM and pump coverage criteria checked against payer policy before the claim is submitted
- Frequency tracking on 95251 interpretation so the 30-day interval is never breached
- DSMT referral, accreditation, and hour-tracking workflows set up and monitored
- Lab monitoring intervals tracked per patient against each payer's limits
- ICD-10 specificity review across diabetes, thyroid, and metabolic diagnoses
- E/M level audit against documented complexity for multi-condition visits
- Prior authorization handled for pumps, CGMs, and high-cost injectables
Codes and rules that matter here99202–99215 E/M, 95249/95250/95251 continuous glucose monitoring, G0108/G0109 diabetes self-management training, 83036 A1c, 84443 TSH, plus E-codes and A-codes for pump and CGM supplies.
Common questions
Why do CGM interpretations keep denying?
Almost always frequency. 95251 is payable once per 30 days by most payers, and a follow-up scheduled at 4 weeks lands inside that window. We track the interval per patient so the claim goes out on a date that will pay.
What does a CGM need to be covered?
Documentation that the patient meets the payer's criteria, typically insulin treatment with a required frequency of testing or documented hypoglycaemia, plus an in-person or telehealth visit within a defined period. The order alone isn't enough; the chart has to establish it.
Can we bill diabetes education?
Yes, if the program meets accreditation requirements and there's a physician referral on file. G0108 covers individual training and G0109 group. Missing referrals are the most common reason these deny, and the hours are capped per year.