Doctor profile · Federal record
Dr. Charles Masaki, MBCHB
Psychiatry Physician (CMS: Psychiatry) · Emergency Medicine Physician · Boston, MA
- NPI 1821518051
- Accepts Medicare
- 15 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
Massachusetts General Hospital, 55 Fruit St.
Boston, MA 02114
(617) 643-4294
Credentials & registration
- NPI registered
- June 2017 — 9 yrs on file
- Profile last updated
- June 30, 2021
- Year of graduation
- 2011 — 15 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State licenses (2)
- Massachusetts #287133 · Massachusetts #272193
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1821518051. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
500
Distinct HCPCS
7
Medicare allowed
$61,748
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 134 | 92 | $126 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 133 | 62 | $84 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 89 | 89 | $184 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 54 | 26 | $53 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 43 | 43 | $138 | |
90792 |
Psychiatric diagnostic evaluation with medical services | 33 | 32 | $180 | |
99285 |
Emergency department visit with high level of medical decision making | 14 | 14 | $183 |
In context: peer comparison
Among 128 peers in Boston Psychiatry Physician, average services per provider: 69. This provider delivers 7.2× the peer median.Frequently asked questions
What is Dr. Charles Masaki's medical specialty?
Dr. Charles Masaki practices Psychiatry Physician in Boston, MA.
Where does Dr. Charles Masaki practice?
Dr. Charles Masaki practices at Massachusetts General Hospital, Boston, MA 02114. Office phone: 6176434294.
What is Dr. Charles Masaki's NPI?
Dr. Charles Masaki's National Provider Identifier (NPI) is 1821518051, issued by NPPES.
Does Dr. Charles Masaki accept Medicare assignment?
Yes. Dr. Charles Masaki accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Charles Masaki commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.