M1331 – Patients who were appropriately evaluated during the initial exam and were re-evaluated no later than 8 weeks from initial exam
HCPCS Level II code · M codes: Medical Services and Quality Measures
HCPCS codeM1331
- Long description
- Patients who were appropriately evaluated during the initial exam and were re-evaluated no later than 8 weeks from initial exam
- Short description
- Pts eval ini xm 8 wks
- Pricing indicator
00Not separately priced by Part B (bundled, not covered or Part A only)- Medicare coverage
CCarrier judgment – coverage decided by the Medicare contractor- BETOS category
Z2Undefined codes- Added
- January 1, 2024
- Last change
- January 1, 2024 – No change
Frequently asked questions
What is HCPCS code M1331?
M1331 is a HCPCS Level II code for patients who were appropriately evaluated during the initial exam and were re-evaluated no later than 8 weeks from initial exam.
Does Medicare cover M1331?
The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby M codes
- M1323 – Patients seen within 7 weeks following the date of injection and are screened for elevated intraocular pressure (iop) with tonometry with documented iop >25 mm hg and a plan of care was documented
- M1324 – Patients who had an intravitreal or periocular corticosteroid injection (e.g., triamcinolone, preservative-free triamcinolone, dexamethasone, dexamethasone intravitreal implant, or fluocinolone intravitreal implant)
- M1325 – Patients who were not seen for reasons documented by clinician for patient or medical reasons (e.g., inadequate time for follow-up, patients who received a prior intravitreal or periocular steroid injection within the last six (6) months and had a subsequent iop evaluation with iop <25mm hg within seven (7) weeks of treatment)
- M1326 – Patients with a diagnosis of hypotony
- M1327 – Patients who were not appropriately evaluated during the initial exam and/or who were not re-evaluated within 8 weeks
- M1328 – Patients with a diagnosis of acute vitreous hemorrhage
- M1329 – Patients with a post-operative encounter of the eye with the acute pvd within 2 weeks before the initial encounter or 8 weeks after initial acute pvd encounter
- M1330 – Documentation of patient reason(s) for not having a follow up exam (e.g., inadequate time for follow up)
- M1332 – Patients who were not appropriately evaluated during the initial exam and/or who were not re-evaluated within 2 weeks
- M1333 – Acute vitreous hemorrhage
- M1334 – Patients with a post-operative encounter of the eye with the acute pvd within 2 weeks before the initial encounter or 2 weeks after initial acute pvd encounter
- M1335 – Documentation of patient reason(s) for not having a follow up exam (e.g., inadequate time for follow up)
- M1336 – Patients who were appropriately evaluated during the initial exam and were re-evaluated no later than 2 weeks
- M1337 – Acute pvd
- M1338 – Patients who had follow-up assessment 30 to 180 days after the index assessment who did not demonstrate positive improvement or maintenance of functioning scores during the performance period
- M1339 – Patients who had follow-up assessment 30 to 180 days after the index assessment who demonstrated positive improvement or maintenance of functioning scores during the performance period
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.