Doctor profile · Federal record
Dr. Rock Jean-Guillaume, D.O.
Emergency Medicine Physician (CMS: Emergency Medicine) · Holden, MA
- NPI 1730157918
- Accepts Medicare
- 28 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
5 Shrewsbury St Ste D
Holden, MA 01520
(508) 829-3800
fax (508) 829-3802 - Additional location
-
2040 Boston RD Ste 5
Wilbraham, MA 010951380
(413) 599-3800
fax (413) 279-1900 - Additional location
-
55 Lake Ave N
Worcester, MA 016550002
(508) 421-1400
fax (508) 421-1490
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- November 22, 2020
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- Massachusetts #215241
- Medicaid
- MA #110006102A
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1730157918. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
373
Distinct HCPCS
5
Medicare allowed
$50,090
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 196 | 194 | $168 | |
99284 |
Emergency department visit with moderate level of medical decision making | 119 | 118 | $115 | |
99283 |
Emergency department visit with low level of medical decision making | 31 | 30 | $68 | |
90662 |
Influenza vaccine split virus, preservative free | 14 | 14 | $72 | |
99211 |
Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional | 13 | 12 | $24 |
In context: peer comparison
Among 5 peers in this city , average services per provider: 55. This provider delivers 6.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
117
Patients
115
Total drug cost
$612
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 37 | 35 | $66 |
| Cephalexin | Generic | 25 | 25 | $153 |
| Azithromycin | Generic | 20 | 20 | $109 |
| Ondansetron Odt (Ondansetron) | Brand | 20 | 20 | $252 |
| Oxycodone Hcl | Generic | 15 | 15 | $32 |
Frequently asked questions
What is Dr. Rock Jean-Guillaume's medical specialty?
Dr. Rock Jean-Guillaume practices Emergency Medicine Physician in Holden, MA.
Where does Dr. Rock Jean-Guillaume practice?
Dr. Rock Jean-Guillaume practices at 5 Shrewsbury St Ste D, Holden, MA 01520. Office phone: 5088293800.
What is Dr. Rock Jean-Guillaume's NPI?
Dr. Rock Jean-Guillaume's National Provider Identifier (NPI) is 1730157918, issued by NPPES.
Does Dr. Rock Jean-Guillaume accept Medicare assignment?
Yes. Dr. Rock Jean-Guillaume accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Rock Jean-Guillaume commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with low level of medical decision making (HCPCS 99283). Source: CMS Medicare Physician & Other Practitioners file.