NPIMap

Individual provider Active NPI

John Robert Nienow, MD

  • Infectious Disease Physician
  • San Francisco, CA
National Provider Identifier
1861472649
Registry record updated May 6, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Infectious Disease PhysicianTaxonomy code 207RI0200X
License
00G795490 Issued in CA
Practice address
2186 Geary Blvd Ste 314
San Francisco, CA 94115-3457
Phone
(415) 202-1550
Fax
(415) 776-8233
NPI assigned
Jan 18, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on May 6, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Infectious Disease Physician 207RI0200X 00G795490 CA Primary

Addresses

Primary practice location

2186 Geary Blvd Ste 314
San Francisco, CA 94115-3457

Mailing address

2186 Geary Blvd Ste 314
San Francisco, CA 94115-3457
Phone (415) 202-1550

Other practice location 1

558 Clayton St
PSSB G500
San Francisco, CA 94117-2907
Phone (415) 746-1950

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Not listed in the public Medicare enrollment file
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.
Opted out of Medicare
Yes, effective Jan 1, 2026 through Jan 1, 2028

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
Yale University School of Medicine, 1988
Medicare assignment
Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

2300 California St
Suite 306
San Francisco, CA 94115-2754

Hospital & facility affiliations

  • Health Link Home Health Agency Home health agency, San Francisco, CA, CCN 059016
  • California Pacific Medical Center- Van Ness Campus Hospital, San Francisco, CA, CCN 050047
  • California Pacific Medical Ctr-Davies Campus Hosp Hospital, San Francisco, CA, CCN 050008
  • California Pacific Medical Center - Mission Bernal Hospital, San Francisco, CA, CCN 050055
  • Novato Community Hospital Hospital, Novato, CA, CCN 050131
  • UCSF Medical Center Hospital, San Francisco, CA, CCN 050454

Merit-based Incentive Payment System (MIPS)

Final score
26.15 of 100Reported as individual
Quality
0
Improvement activities
0
Cost
87.18

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
00G795490CAMDInfectious Disease Physician

Practice roles

OrganizationSpecialtyStatusNew patients
California Pacific Medical Group, Inc. PastSince Nov 1, 2019 Accepting new patients

Organizations & group practices 1

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.

Hospital & facility affiliations 6

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

NPI Registry JSON

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

{
    "created_epoch": "1137542400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1746489600000",
    "number": "1861472649",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2186 GEARY BLVD STE 314",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941153457",
            "telephone_number": "415-202-1550",
            "fax_number": "415-776-8233"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2186 GEARY BLVD STE 314",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941153457",
            "telephone_number": "415-202-1550",
            "fax_number": "415-776-8233"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "558 Clayton St",
            "address_2": "PSSB G500",
            "address_purpose": "LOCATION",
            "city": "San Francisco",
            "state": "CA",
            "postal_code": "941172907",
            "country_code": "US",
            "telephone_number": "415-746-1950",
            "fax_number": "415-431-9909",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NIENOW",
        "first_name": "JOHN",
        "middle_name": "ROBERT",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-01-18",
        "last_updated": "2025-05-06",
        "certification_date": "2025-05-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RI0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Infectious Disease",
            "state": "CA",
            "license": "00G795490",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in San Francisco, CA

Sources for this page

Verify at the official NPI Registry.