DR. THAIS SIEWERT PMHNP - NPI 1194348318 - Nurse Practitioner in La Jolla, CA

Q: What is Thais Siewert's NPI number?

The NPI number for Thais Siewert is 1194348318. It was assigned to this individual provider in the NPPES registry on May 21, 2020. The provider is also known as Dr. Thais Nan Kim.

Q: What is Thais Siewert's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Q: When was this NPI record last updated?

The NPPES record for Thais Siewert was last updated on November 26, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.

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About Dr. Thais Siewert Pmhnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. THAIS SIEWERT PMHNP (NPI 1194348318) is an individual psychiatric/mental health provider in La Jolla, California, licensed in California (95014585) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1194348318

Entity TypeIndividualFemale

Primary Taxonomy363LP0808X

Provider Legal NameDR. THAIS SIEWERTCredential: PMHNP

Location Address888 PROSPECT ST STE 200La Jolla, CA 92037-4261

Mailing Address17595 Harvard Ave, Ste C, #169Irvine, CA 92614-8574 · (949) 424-5444

Phone(415) 849-2466

Fax(415) 376-4529

Sole ProprietorYes

Enumeration DateMay 21, 2020

Last NPPES UpdateNovember 26, 20256 updates tracked since enumeration

NPPES CertifiedNovember 26, 2025

✔ NPI 1194348318 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LP0808X

License✔ Licensed in CA · 95014585

888 PROSPECT ST STE 200, La Jolla, CA 92037

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Other Names 1

Other Name (5)Dr. Thais Nan Kim

Secondary Practice Locations 2

Location 14685 MacArthur Ct Ste 340Newport Beach, CA 92660-1855 · Phone (949) 424-4544

Location 21390 Market St Ste 200San Francisco, CA 94102-5404 · Phone (415) 849-2466 · Fax (415) 376-4529

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Thais Siewert Pmhnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92037 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$94.87 typical visit price

range $62.10 – $184.71

Typical copayment $23.71 (range $15.52 – $46.17)

Most-billed visit code 99203

Established Patient

$108.42 typical visit price

range $20.62 – $151.42

Typical copayment $27.10 (range $5.15 – $37.85)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.58/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

87.86

Improvement Activities

Cost

18.12

Other Providers at the Same Location NPPES 10

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. KAREN ANITA ZELAYA-KENDALL PH.D.

Psychologist (Clinical)