Rock H. Jean-Guillaume, D.O.
Emergency Medicine Physician · Holden, MA
Rock H. Jean-Guillaume, D.O. is an emergency medicine physician with a practice address in Holden, Massachusetts, and NPI 1730157918, issued on Mar 14, 2006. Check the license (Massachusetts 215241, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Rock H. Jean-Guillaume
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 215241 MA
Self-reported in NPPES; status is on the state search - Practice location
- 5 Shrewsbury St Ste D, Holden, MA 01520
- Phone
- (508) 829-3800
- Enumerated
- Mar 14, 2006
- Record last updated
- Nov 22, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (508) 829-3802
- Medicaid ID
- 110006102A MA
- Medicare enrollment
- Enrolled (PECOS I20200729000554); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 1998
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,829 in Massachusetts → Look up another NPI →
Also registered at 5 Shrewsbury St Ste D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jason Adams, RNAdministrator Registered Nurse1104788934
- Karen-Whitley Bishop, PAPhysician Assistant1013007293
- Robert Cooke, PA-CPhysician Assistant1639275662
- Richard Freniere, DOEmergency Medicine Physician1023008745
- Arielle Iley, PA-CPhysician Assistant1326589599
- Donald Jackel, DOEmergency Medicine Physician1497745160
Verify Rock H. Jean-Guillaume in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 215241Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average emergency medicine physician in 2024
208 Medicare Part D claims for 151 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 15 claims were for opioids.
Most prescribed
- Prednisone38 claims
- Doxycycline Hyclate20 claims
- Azithromycin16 claims
- Cephalexin14 claims
- Nitrofurantoin Mono-Macro13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Acs Primary Care Physicians - Southeast PCMyrtle Beach, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rock H. Jean-Guillaume among 1,829 emergency medicine physician records in Massachusetts
Rock H. Jean-Guillaume, D.O. is one of 1,829 emergency medicine physician records with a practice address in Massachusetts. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1998 · median 2011 among the 1,200 with a school on file
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 emergency medicine physician records list a practice address in Holden
They are 6 of the 213 NPPES records with a practice address in Holden, and 1,829 emergency medicine physician records in Massachusetts.
All 1,829 in Massachusetts → Every provider in Holden → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Allison Darvish, DOHolden, MA 015201588952451
- Richard Freniere, DOHolden, MA 015201023008745
- Donald Jackel, DOHolden, MA 015201497745160
- William O'Callahan, MDHolden, MA 015201114964186
- Peter Rugg, MDHolden, MA 015201508856121
- Robert Hansen, M.D.Millbury, MA 015271003882192
- Peter Oldak, M.D.Clinton, MA 015101164404851
- Birendra Sinha, M.D.Clinton, MA 015101649209792
Common questions
What is Rock H. Jean-Guillaume, D.O.'s NPI number?
Rock H. Jean-Guillaume, D.O.'s National Provider Identifier (NPI) is 1730157918, issued on Mar 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rock H. Jean-Guillaume, D.O. located?
The NPPES record lists a practice address at 5 Shrewsbury St Ste D, Holden, MA, 01520. Phone: (508) 829-3800. Providers update this record themselves, so call before visiting.
How can I verify Rock H. Jean-Guillaume, D.O.'s license?
NPPES lists Massachusetts license number 215241, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rock H. Jean-Guillaume, D.O. prescribe under Medicare Part D?
In 2024, Rock H. Jean-Guillaume, D.O. had 208 Medicare Part D claims for 151 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.