Michael Denis Royster, M.D.
Internal Medicine Physician · Hyannis, MA
Michael Denis Royster, M.D. is an internal medicine physician with a practice address in Hyannis, Massachusetts, and NPI 1184913899, issued on Apr 4, 2011. Check the license (Massachusetts 258692, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Michael Denis Royster
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 258692 MA
Self-reported in NPPES; status is on the state search - Practice location
- 27 Park St, Hyannis, MA 02601
- Phone
- (508) 862-5976
- Enumerated
- Apr 4, 2011
- Record last updated
- Jul 26, 2026
- Medicare enrollment
- Enrolled (PECOS I20140805003090); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 27 Park St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Christine Anstatt, PTPhysical Therapist1417074105
- Timothy Arruda, MDHospitalist Physician1538134333
- Harvey Auerbach, MDAnesthesiology Physician1881614246
- Eric Band, M.D.Anesthesiology Physician1033475439
- Scott Barron, MDPediatrics Physician1992790760
Verify Michael Denis Royster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 258692Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
135 Medicare Part D claims for 86 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone17 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 85.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Physicians OF Cape Cod HospitalHyannis, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Denis Royster among 6,825 internal medicine physician records in Massachusetts
Michael Denis Royster, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 65% of them.
- NPI issued2011 · 65% of these records are older, 33% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2011 · median 2004 among the 4,103 with a school on file
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
51 internal medicine physician records list a practice address in Hyannis
They are 51 of the 1,457 NPPES records with a practice address in Hyannis, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Hyannis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Grover Baxley, MDHyannis, MA 026011912961707
- Conrad Benoit, D.O.Hyannis, MA 026011629059985
- Paul Bizinkauskas, M.D.Hyannis, MA 026011578521415
- James Chingos, MDHyannis, MA 026011508826421
- Arthur Crago, MDHyannis, MA 026011851340475
- Abraham Dietz, MDHyannis, MA 026011518917186
- Andrew Flewwelling, MDHyannis, MA 026011396717468
- Patricia Hammel, MDHyannis, MA 026011467403543
Common questions
What is Michael Denis Royster, M.D.'s NPI number?
Michael Denis Royster, M.D.'s National Provider Identifier (NPI) is 1184913899, issued on Apr 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Michael Denis Royster, M.D. located?
The NPPES record lists a practice address at 27 Park St, Hyannis, MA, 02601. Phone: (508) 862-5976. Providers update this record themselves, so call before visiting.
How can I verify Michael Denis Royster, M.D.'s license?
NPPES lists Massachusetts license number 258692, 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 Michael Denis Royster, M.D. prescribe under Medicare Part D?
In 2024, Michael Denis Royster, M.D. had 135 Medicare Part D claims for 86 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Michael Denis Royster, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.