Doctor profile · Federal record
Dr. Mary Fitzsimons, M.D
Emergency Medicine Physician (CMS: Emergency Medicine) · Antioch, CA
- NPI 1053330431
- Accepts Medicare
- MIPS 86.3 / 100 · 2023
- 45 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3901 Lone Tree Way
Antioch, CA 945096200
(925) 779-7273 - Mailing address
-
2100 Powell St, Ste 900
Emeryville, CA 946081826
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- October 24, 2007
- Year of graduation
- 1981 — 45 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #G56339
- Medicaid
- CA #00G563390
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1053330431. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
858
Distinct HCPCS
5
Medicare allowed
$105,221
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 303 | 272 | $9 | |
99285 |
Emergency department visit with high level of medical decision making | 236 | 226 | $188 | |
99284 |
Emergency department visit with moderate level of medical decision making | 134 | 126 | $130 | |
99291 |
Critical care, first 30-74 minutes | 116 | 110 | $234 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 69 | 66 | $194 |
In context: peer comparison
Among 7 peers in this city , average services per provider: 118. This provider delivers 7.3× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
194
Patients
191
Total drug cost
$1,309
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Ondansetron Hcl | Generic | 55 | 53 | $323 |
| Cephalexin | Generic | 46 | 46 | $503 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 45 | 45 | $264 |
| Prednisone | Generic | 21 | 20 | $96 |
| Ibuprofen | Generic | 16 | 16 | $67 |
| Azithromycin | Generic | 11 | 11 | $56 |
Frequently asked questions
What is Dr. Mary Fitzsimons's medical specialty?
Dr. Mary Fitzsimons practices Emergency Medicine Physician in Antioch, CA.
Where does Dr. Mary Fitzsimons practice?
Dr. Mary Fitzsimons practices at 3901 Lone Tree Way, Antioch, CA 945096200. Office phone: 9257797273.
What is Dr. Mary Fitzsimons's NPI?
Dr. Mary Fitzsimons's National Provider Identifier (NPI) is 1053330431, issued by NPPES.
Does Dr. Mary Fitzsimons accept Medicare assignment?
Yes. Dr. Mary Fitzsimons accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mary Fitzsimons commonly perform?
Top Medicare-reported procedures in 2023: Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (HCPCS 93010); Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with moderate level of medical decision making (HCPCS 99284). Source: CMS Medicare Physician & Other Practitioners file.