David Sitzer, PH.D.

Primary specialty

PsychologistTaxonomy code 103T00000X

License

PSY 13538 Issued in CA

Practice address

667 Lytton Ave
Palo Alto, CA 94301-1335

Phone

(650) 269-0657

NPI assigned

Mar 19, 2007

Reactivated

Jul 18, 2025

Last updated

Jul 18, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Philosophy

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Dr. David L. Sitzer

  • Counseling Psychologist
  • Palo Alto, CA
  • NPI 1962876896
  NPD Authorized official

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

{
    "created_epoch": "1174262400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752796800000",
    "number": "1619091253",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "375 CAMBRIDGE AVE",
            "city": "PALO ALTO",
            "state": "CA",
            "postal_code": "943061613",
            "telephone_number": "650-326-6576",
            "fax_number": "650-326-1340"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "667 LYTTON AVE",
            "city": "PALO ALTO",
            "state": "CA",
            "postal_code": "943011335",
            "telephone_number": "650-269-0657"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SITZER",
        "first_name": "DAVID",
        "credential": "PH.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2007-03-19",
        "last_updated": "2025-07-18",
        "certification_date": "2020-08-31",
        "deactivation_date": "2025-03-25",
        "reactivation_date": "2025-07-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103T00000X",
            "taxonomy_group": "",
            "desc": "Psychologist",
            "state": "CA",
            "license": "PSY 13538",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Brandi Sinkfield, M.D.
• Christianna G Sippel
• Thanit Noom Sirimaturos, PT, DPT, FAAOMPT
• Daniel Sisti, MD
• Daegan Ewan Sit, MD
• Dharshi Sivakumar, MD
• Lakshitha Sivanandan, AGACNP, RN
• Sarangan Sivanesan, LMFT
• Malathy Sivapalasingam, NP
• Subramanian Sivarajan, M.D.

• Psychologist in Palo Alto, CA
• Providers in Palo Alto, CA by specialty
• Psychologist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 18, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.