Michael Denis Royster, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

258692 Issued in MA

Practice address

27 Park St
Hyannis, MA 02601-5230

Phone

(508) 862-5976

NPI assigned

Apr 4, 2011

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Internal Medicine

Education

Other, 2011

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Physicians of Cape Cod HospitalGroup PAC ID 9638326671, 330 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Cape Cod Hospital Hospital, Hyannis, MA, CCN 220012
• Falmouth Hospital Hospital, Falmouth, MA, CCN 220135

Merit-based Incentive Payment System (MIPS)

Final score

84.3 of 100Reported as group

Quality

71.45

Promoting interoperability

100

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Physicians of Cape Cod Hospital

  • Neuroradiology Physician
  • Hyannis, MA
  • NPI 1679832364

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Cape Cod Hospital Inc

  • General Acute Care Hospital
  • Hyannis, MA
  • NPI 1114984671
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Cape Cod Hospital Inc

  • General Acute Care Hospital
  • Hyannis, MA
  • NPI 1114984671
  Care Compare affiliation
• Falmouth Hospital Association Inc

  • General Acute Care Hospital
  • Falmouth, MA
  • NPI 1336106806
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1301875200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785024000000",
    "number": "1184913899",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "47 POPPLE BOTTOM ROAD",
            "city": "SANDWICH",
            "state": "MA",
            "postal_code": "02563",
            "telephone_number": "504-258-0346"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "27 PARK ST",
            "city": "HYANNIS",
            "state": "MA",
            "postal_code": "026015230",
            "telephone_number": "508-862-5976"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ROYSTER",
        "first_name": "MICHAEL",
        "middle_name": "DENIS",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2011-04-04",
        "last_updated": "2026-07-26",
        "certification_date": "2026-07-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "258692",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Karen Ross
• Julia Rossman
• John Roubil, MD
• Melissa Routhier
• Alexandra Rowell
• Luis Cohen Rubin, DDS, MS
• Stuart William Ruch, M.D.
• Nathan Rudman, MD
• Peter W Rufleth, MD
• Erin Rufo

• Internal Medicine Physician in Hyannis, MA
• Providers in Hyannis, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 26, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.