Doctor profile · Federal record
Dr. Margaret Greven, M.D.
Ophthalmology Physician (CMS: Ophthalmology) · Winston Salem, NC
- NPI 1821380874
- Accepts Medicare
- 15 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
Medical Center Blvd Dept of Ophthalmology
Winston Salem, NC 271573216
(336) 716-4091 - Mailing address
-
Po Box 602658
Charlotte, NC 282602658
Credentials & registration
- NPI registered
- May 2011 — 15 yrs on file
- Profile last updated
- July 21, 2022
- Year of graduation
- 2011 — 15 yrs since
- Specialty taxonomy
- 207W00000X — NUCC code
- State license (1)
- North Carolina #2017-01126
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1821380874. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
2,738
Distinct HCPCS
10
Medicare allowed
$344,200
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
92134 |
Imaging of retina | 905 | 386 | $23 | |
67028 |
Injection of drug into eye | 672 | 142 | $98 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 362 | 274 | $62 | |
J0178 |
Injection, aflibercept, 1 mg | 216 | 23 | $865 | |
67028 |
Injection of drug into eye | 177 | 40 | $118 | |
92134 |
Imaging of retina | 158 | 52 | $38 | |
J9035 |
Injection, bevacizumab, 10 mg | 100 | 18 | $71 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 70 | 59 | $93 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 44 | 31 | $84 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 18 | 18 | $127 |
In context: peer comparison
Among 13 peers in this city , average services per provider: 262. This provider delivers 10× the peer median.Open Payments
Industry payments received
All-time total
$438
Transactions
3
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Genentech, Inc. | 2 | $291.18 | |
| Regeneron Pharmaceuticals, Inc. | 1 | $146.88 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
247
Patients
127
Total drug cost
$9,249
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisolone Acetate | Generic | 109 | 77 | $3,952 |
| Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) | Brand | 35 | 18 | $864 |
| Timolol Maleate | Generic | 30 | 18 | $243 |
| Brimonidine Tartrate | Generic | 28 | 14 | $3,018 |
| Latanoprost | Generic | 22 | 0 | $82 |
| Dorzolamide Hcl | Generic | 12 | 0 | $590 |
| Ketorolac Tromethamine | Generic | 11 | 0 | $499 |
Frequently asked questions
What is Dr. Margaret Greven's medical specialty?
Dr. Margaret Greven practices Ophthalmology Physician in Winston Salem, NC.
Where does Dr. Margaret Greven practice?
Dr. Margaret Greven practices at Medical Center Blvd Dept of Ophthalmology, Winston Salem, NC 271573216. Office phone: 3367164091.
What is Dr. Margaret Greven's NPI?
Dr. Margaret Greven's National Provider Identifier (NPI) is 1821380874, issued by NPPES.
Does Dr. Margaret Greven accept Medicare assignment?
Yes. Dr. Margaret Greven accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Margaret Greven commonly perform?
Top Medicare-reported procedures in 2023: Imaging of retina (HCPCS 92134); Injection of drug into eye (HCPCS 67028); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.