Jeffrey C Mark, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

G83524 Issued in CA

Practice address

2101 Geer Rd
Suite #118
Turlock, CA 95382-2454

Phone

(209) 669-5000

Fax

(209) 669-5001

NPI assigned

May 9, 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

GastroenterologyAlso: Internal Medicine

Education

University of Illinois College of Med (CHI/Peor/Rock/CHM-Urb), 1992

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

Hospital & facility affiliations

• Emanuel Medical Center Hospital, Turlock, CA, CCN 050179

Merit-based Incentive Payment System (MIPS)

Final score

81.49 of 100Reported as individual

Quality

71.67

Improvement activities

40

Cost

76.06

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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.

• Adult & Pediatric Gastroenterology Medical Center

  • Gastroenterology Physician
  • San Ramon, CA
  • NPI 1538367818
  Medicare reassignment NPD Authorized official
• Sebastian Ayala Medical Corporation

  • Clinic/Center
  • Rocklin, CA
  • NPI 1952291890
  NPD
• Emanuel Medical Center, Inc.

  • General Acute Care Hospital
  • Turlock, CA
  • NPI 1174615330
  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)
• San Ramon Regional Medical Center, LLC

  • General Acute Care Hospital
  • San Ramon, CA
  • NPI 1932131489
  NPD (past)
• Stanford Health Care Tri-Valley

  • General Acute Care Hospital
  • Pleasanton, CA
  • NPI 1144389941
  NPD (past)
• Sutter Valley Hospitals

  • General Acute Care Hospital
  • Modesto, CA
  • NPI 1699129601
  NPD (past)

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

• Doctors Medical Center of Modesto, Inc.

  • General Acute Care Hospital
  • Turlock, CA
  • NPI 1396087672
  Care Compare affiliation

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

{
    "created_epoch": "1147132800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1487603155",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2101 GEER RD",
            "address_2": "SUITE #118",
            "city": "TURLOCK",
            "state": "CA",
            "postal_code": "953822454",
            "telephone_number": "209-669-5000",
            "fax_number": "209-669-5001"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2101 GEER RD",
            "address_2": "SUITE #118",
            "city": "TURLOCK",
            "state": "CA",
            "postal_code": "953822454",
            "telephone_number": "209-669-5000",
            "fax_number": "209-669-5001"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MARK",
        "first_name": "JEFFREY",
        "middle_name": "C",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-09",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "G83524",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Tanya Marie Mangum, L.C.S.W.
• Rungsinee Amanda Manotok, M.S.R.D
• Mark Mangiapane DO Inc
• Mark One Corporation
• Mark One Corporation
• Steven William Marles, MD JD
• Stephanie Marlin
• Valerie Marroquin
• Suzanne Marson
• Ashley Martin

• Gastroenterology Physician in Turlock, CA
• Providers in Turlock, CA by specialty
• Gastroenterology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.