Peter James Mazolewski, M.D.

Primary specialty

Surgery PhysicianTaxonomy code 208600000X

License

A84094 Issued in CA

Practice address

365 Lennon LN Ste 290
Walnut Creek, CA 94598-5915

Phone

(925) 658-5076

Fax

(925) 658-5089

NPI assigned

Oct 11, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

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

General Surgery

Education

University of Southern California Keck School of Medicine, 1994

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Bass Medical GroupGroup PAC ID 9032111281, 292 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• John Muir Medical Center - Concord Campus Hospital, Concord, CA, CCN 050496
• John Muir Medical Center - Walnut Creek Campus Hospital, Walnut Creek, CA, CCN 050180

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: pmazolewski18003@ehr.johnmuirhealth.com
• FHIR API: https://fhir4.healow.com/fhir/r4/IBDGCA

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.

• Bass Medical Group

  • Obstetrics & Gynecology Physician
  • Walnut Creek, CA
  • NPI 1174253405
  Medicare reassignment Care Compare group NPD
• John Muir Trauma Physicians Billing Service

  • Hospitalist Physician
  • Walnut Creek, CA
  • NPI 1093864837
  Medicare reassignment NPD
• Mazolewski Oc Medical PC

  • Physical Medicine & Rehabilitation Physician
  • San Juan Capistrano, CA
  • NPI 1841581162
  NPD (past) Authorized official
• Bass Medical Group

  • Orthopaedic Surgery Physician
  • Walnut Creek, CA
  • NPI 1043616600
  NPD
• Bass Medical Group

  • Orthopaedic Surgery Physician
  • San Ramon, CA
  • NPI 1467329904
  NPD
• John Muir Trauma Physicians Billing Service

  • Trauma Surgery Physician
  • Walnut Creek, CA
  • NPI 1962551861
  NPD
• Bass Medical Group

  • Specialist
  • Walnut Creek, CA
  • NPI 1154401941
  NPD (past)
• Dignity Health

  • Skilled Nursing Facility
  • Mount Shasta, CA
  • NPI 1376535344
  NPD (past)
• Dignity Health

  • General Acute Care Hospital
  • Redding, CA
  • NPI 1477671535
  NPD (past)
• Greathouse Chiropractic Inc

  • Chiropractor
  • San Clemente, CA
  • NPI 1902959778
  NPD (past)
• John Muir Health

  • Rehabilitation Hospital Unit
  • Walnut Creek, CA
  • NPI 1447269303
  NPD (past)
• John Muir Health

  • General Acute Care Hospital
  • Concord, CA
  • NPI 1801821376
  NPD (past)

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

• John Muir Health

  • General Acute Care Hospital
  • Walnut Creek, CA
  • NPI 1740215219
  Care Compare affiliation
• John Muir Health

  • General Acute Care Hospital
  • Concord, CA
  • NPI 1801821376
  Care Compare affiliation

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

{
    "created_epoch": "1160524800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1740528000000",
    "number": "1710076773",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "365 LENNON LN STE 290",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945985915"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "365 LENNON LN STE 290",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945985915",
            "telephone_number": "925-658-5076",
            "fax_number": "925-658-5089"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAZOLEWSKI",
        "first_name": "PETER",
        "middle_name": "JAMES",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-10-11",
        "last_updated": "2025-02-26",
        "certification_date": "2025-02-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "174400000X",
            "taxonomy_group": "",
            "desc": "Specialist",
            "state": "CA",
            "license": "A84094",
            "primary": false
        },
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "CA",
            "license": "A84094",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Florcena Mayo, CRNA
• Robert W Mayo, MD
• Meagan Lynn Mazany
• Martin F. Mazar, MD
• Kathleen Mazolewski, MFT, PT
• MBF Enterprises LLC
• Amanda Kay McAllister, PHARMD
• Ryan Lyndall McAllister
• Teri McAllister
• Shelly Ann McArdle

• Surgery Physician in Walnut Creek, CA
• Providers in Walnut Creek, CA by specialty
• Surgery Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 26, 2025; 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.