Doctor profile · Federal record
Dr. Michael Halassa, MBBS, PHD
Psychiatry Physician (CMS: Psychiatry) · Boston, MA
- NPI 1811124639
- Accepts Medicare
- MIPS 88.6 / 100 · 2023
- 22 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
Massachusetts General Hospital, 55 Fruit Street
Boston, MA 02114
(617) 726-2066 - Additional location
-
200 May St
South Attleboro, MA 027035520
(508) 761-8500 - Additional location
-
386 Stanley St
Fall River, MA 027206009
(508) 679-5222
fax (508) 673-3182
Credentials & registration
- NPI registered
- June 2009 — 17 yrs on file
- Profile last updated
- September 23, 2025
- Year of graduation
- 2004 — 22 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Massachusetts #L-240799
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1811124639. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
244
Distinct HCPCS
1
Medicare allowed
$10,986
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 244 | 37 | $45 |
In context: peer comparison
Among 128 peers in Boston Psychiatry Physician, average services per provider: 69. This provider delivers 3.5× the peer median.Frequently asked questions
What is Dr. Michael Halassa's medical specialty?
Dr. Michael Halassa practices Psychiatry Physician in Boston, MA.
Where does Dr. Michael Halassa practice?
Dr. Michael Halassa practices at Massachusetts General Hospital, Boston, MA 02114. Office phone: 6177262066.
What is Dr. Michael Halassa's NPI?
Dr. Michael Halassa's National Provider Identifier (NPI) is 1811124639, issued by NPPES.
Does Dr. Michael Halassa accept Medicare assignment?
Yes. Dr. Michael Halassa accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Michael Halassa commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with straightforward or low level of medical decision making (HCPCS 99231). Source: CMS Medicare Physician & Other Practitioners file.