Michael Yao-Jen Chang, D.O.

Primary specialty

Pain Medicine (Physical Medicine & Rehabilitation) PhysicianTaxonomy code 2081P2900X

License

20A8518 Issued in CA

Practice address

2405 Shadelands Dr
Walnut Creek, CA 94598-2444

Phone

(925) 939-8585

Fax

(925) 933-2709

NPI assigned

Sep 20, 2006

Sex

Male

Sole proprietor

No

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 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

Physical Medicine and RehabilitationAlso: Pain Management

Education

Other, 2002

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Golden State Orthopedics and SpineGroup PAC ID 8224940739, 186 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Sutter Delta Medical Center Hospital, Antioch, CA, CCN 050523
• John Muir Medical Center - Walnut Creek Campus Hospital, Walnut Creek, CA, CCN 050180
• John Muir Medical Center - Concord Campus Hospital, Concord, CA, CCN 050496

Merit-based Incentive Payment System (MIPS)

Final score

75 of 100Reported as group

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles (8 of 9)

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: michael.chang@direct.muirortho.nextgenshare.com

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.

• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • Walnut Creek, CA
  • NPI 1972552990

  CA

  Medicare reassignment Care Compare group NPD
• John Muir Trauma Physicians Billing Service

  • Hospitalist Physician
  • Walnut Creek, CA
  • NPI 1093864837

  CA

  Medicare reassignment NPD
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • Brentwood, CA
  • NPI 1912252024
  Care Compare group NPD
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • Concord, CA
  • NPI 1427402783
  Care Compare group
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • Walnut Creek, CA
  • NPI 1821488966
  Care Compare group
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • San Ramon, CA
  • NPI 1952656050
  Care Compare group
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • San Jose, CA
  • NPI 1245021401
  NPD
• John Muir Trauma Physicians Billing Service

  • Trauma Surgery Physician
  • Walnut Creek, CA
  • NPI 1962551861
  NPD
• Golden State Orthopedics & Spine

  • Orthopaedic Surgery Physician
  • San Francisco, CA
  • NPI 1457004897
  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

  Hospital

  Care Compare affiliation
• John Muir Health

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

  Hospital

  Care Compare affiliation
• Sutter Bay Hospitals

  • General Acute Care Hospital
  • Antioch, CA
  • NPI 1467808659

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1158710400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762473600000",
    "number": "1205934262",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 31396",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945988396",
            "telephone_number": "925-939-8585",
            "fax_number": "925-933-2709"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2405 SHADELANDS DR",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945982444",
            "telephone_number": "925-939-8585",
            "fax_number": "925-933-2709"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "101 Sand Creek Rd Ste A",
            "address_purpose": "LOCATION",
            "city": "Brentwood",
            "state": "CA",
            "postal_code": "945132539",
            "country_code": "US",
            "telephone_number": "925-939-8585",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "101 Sand Creek Rd Ste B",
            "address_purpose": "LOCATION",
            "city": "Brentwood",
            "state": "CA",
            "postal_code": "945132540",
            "country_code": "US",
            "telephone_number": "925-939-8585",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CHANG",
        "first_name": "MICHAEL",
        "middle_name": "YAO-JEN",
        "credential": "D.O.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-09-20",
        "last_updated": "2025-11-07",
        "certification_date": "2025-11-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2081P2900X",
            "taxonomy_group": "",
            "desc": "Physical Medicine & Rehabilitation, Pain Medicine",
            "state": "CA",
            "license": "20A8518",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jane Ting Chang, PHARMD
• Judy Chang, O.D.
• Katherine Chang, NP
• Leatrice L Chang, MD
• Lisbeth Chang
• Nancy Y. Chang, MD
• Natalie Chang, M.D.
• Natalie Y Chang, D.O.
• Randall Eric Chang, D.D.S.
• Richard Minyoung Chang, M.D.

• All providers in Walnut Creek, CA
• Pain Medicine (Physical Medicine & Rehabilitation) Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 7, 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.