Doctor profile · Federal record
Dr. Mary Ellen O'Brien, M.D.
Internal Medicine Physician (CMS: Hospitalist) · Providence, RI
- NPI 1144425000
- Accepts Medicare
- MIPS 79.9 / 100 · 2023
- 19 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
593 Eddy St
Providence, RI 029034923
(401) 444-4083
fax (401) 444-3056
Credentials & registration
- NPI registered
- June 2007 — 19 yrs on file
- Profile last updated
- January 22, 2010
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Rhode Island #LP01243
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1144425000. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
623
Distinct HCPCS
5
Medicare allowed
$107,533
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 466 | 454 | $184 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 96 | 96 | $137 | |
99221 |
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 33 | 33 | $88 | |
99291 |
Critical care, first 30-74 minutes | 15 | 15 | $225 | |
99235 |
Initial hospital care with same-day admission and discharge with moderate level of medical decision making, per day, if using time, at least 70 minutes | 13 | 13 | $169 |
In context: peer comparison
Among 103 peers in Providence Internal Medicine Physician, average services per provider: 76. This provider delivers 8.2× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. Mary Ellen O'Brien's medical specialty?
Dr. Mary Ellen O'Brien practices Internal Medicine Physician in Providence, RI.
Where does Dr. Mary Ellen O'Brien practice?
Dr. Mary Ellen O'Brien practices at 593 Eddy St, Providence, RI 029034923. Office phone: 4014444083.
What is Dr. Mary Ellen O'Brien's NPI?
Dr. Mary Ellen O'Brien's National Provider Identifier (NPI) is 1144425000, issued by NPPES.
Does Dr. Mary Ellen O'Brien accept Medicare assignment?
Yes. Dr. Mary Ellen O'Brien accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mary Ellen O'Brien commonly perform?
Top Medicare-reported procedures in 2023: Initial hospital care with moderate level of medical decision making (HCPCS 99223); Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222); Initial hospital care with straightforward or low level of medical decision making (HCPCS 99221). Source: CMS Medicare Physician & Other Practitioners file.