Andrew G. Iwach MD a Professional Corporation

Primary specialty

Orthopaedic Surgery PhysicianTaxonomy code 207X00000X

Legal business name

ANDREW G. IWACH MD A PROFESSIONAL CORPORATION

Doing business as

Glaucoma Associates of Northern California

Practice address

55 Stevenson St
San Francisco, CA 94105-2936

Phone

(415) 981-2020

Fax

(415) 981-2019

NPI assigned

Nov 6, 2006

Last updated

Aug 3, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Dr. Andrew Iwach, M.D.NPI 1871682088

Title

Owner

Phone

(415) 989-2020

Specialties & licenses 2

Addresses

Other identifiers 1

Other names 1

• Glaucoma Associates of Northern California Doing business as

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

Locations

Practitioners 8

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Andrew George Iwach, MD

  • Ophthalmology Physician
  • San Francisco, CA
  • NPI 1871682088
  Medicare reassignment Care Compare group NPD Authorized official
• Terri-Diann Pickering, MD

  • Ophthalmology Physician
  • San Francisco, CA
  • NPI 1235228453
  Medicare reassignment Care Compare group NPD
• Sunita Radhakrishnan, M.D.

  • Ophthalmology Physician
  • San Francisco, CA
  • NPI 1578513248
  Medicare reassignment Care Compare group NPD
• Shan C Lin, MD

  • Ophthalmology Physician
  • San Francisco, CA
  • NPI 1730131236
  Medicare reassignment
• Christopher John Dickens, M.D.

  • Ophthalmology Physician
  • Oakland, CA
  • NPI 1962560326
  NPD (past)
• May Szeto, O.D.

  • Optometrist
  • San Francisco, CA
  • NPI 1942495122
  NPD (past)
• Patricia Cheoy Wong, M.D.

  • Ophthalmology Physician
  • San Francisco, CA
  • NPI 1922166305
  NPD (past)
• Valerie Rose Danford, OD

  • Optometrist
  • Delaware, OH
  • NPI 1023559887
  NPD (past)

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

{
    "created_epoch": "1162771200000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1785715200000",
    "number": "1598834632",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "55 STEVENSON ST",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941052936",
            "telephone_number": "415-981-2020",
            "fax_number": "415-981-2019"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 STEVENSON ST",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941052936",
            "telephone_number": "415-981-2020",
            "fax_number": "415-981-2019"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "ANDREW G. IWACH MD A PROFESSIONAL CORPORATION",
        "organizational_subpart": "NO",
        "enumeration_date": "2006-11-06",
        "last_updated": "2026-08-03",
        "certification_date": "2026-08-03",
        "status": "A",
        "authorized_official_last_name": "IWACH",
        "authorized_official_first_name": "ANDREW",
        "authorized_official_title_or_position": "OWNER",
        "authorized_official_telephone_number": "415-989-2020",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "M.D."
    },
    "taxonomies": [
        {
            "code": "207W00000X",
            "taxonomy_group": "",
            "desc": "Ophthalmology",
            "state": "CA",
            "license": "G56142",
            "primary": false
        },
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "CA",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G561420",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Glaucoma Associates of Northern California",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

• Dennis Andreatta, RN, MSN, CRRN, PHN
• Elisabeth Claire Andreeff, MS
• Inocensia Andres, LVN
• Lisa Abdilova Andresen, ASW #89490
• Andrew Calman (Premier Eyecare)
• Andrew Garcia Marriage and Family Therapy Inc
• Andrew S Williams M D
• Andrew Schlegelmilch PH D
• Brian Thomas Andrews, M.D.
• Bryan W. Andrews, MD

• Orthopaedic Surgery Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Orthopaedic Surgery Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 3, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.