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RYAN THOMAS ASH MD, PHD
NPI 1023514411
Psychiatry & Neurology - Psychiatry in Palo Alto, CA

Active since April 04, 2018PECOS Enrolled
76.5/100
CMS Quality Rating
300 PASTEUR DR, PALO ALTO, CA 94304(650) 723-4000 Get Directions Write a Review

NPPES record last updated: October 18, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 29, 2024, Sep 26, 2022 (2 updates tracked since 2022).

About Ryan Thomas Ash Md, Phd NPPES

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

RYAN THOMAS ASH MD, PHD (NPI 1023514411) is an individual psychiatry provider in Palo Alto, California, licensed in California (A165366) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Baylor College Of Medicine (2016).

NPPES Registry Identity

NPI1023514411
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameRYAN THOMAS ASHCredential: MD, PHD
Location Address300 PASTEUR DRPalo Alto, CA 94304-2203
Mailing Address300 Pasteur DrPalo Alto, CA 94304-2203 · (650) 723-4000
Phone(650) 723-4000
Sole ProprietorNo
Medical School CMSBaylor College Of MedicineGraduated 2016
Enumeration DateApril 4, 2018
Last NPPES UpdateOctober 18, 20252 updates tracked since enumeration
NPPES CertifiedOctober 18, 2025
✔ NPI 1023514411 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A165366
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
300 PASTEUR DR, Palo Alto, CA 94304
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1675 18th StSan Francisco, CA 94143-4200 · Phone (415) 476-7000
Location 237332 Diamond Oaks DrMagnolia, TX 77355-7526 · Phone (281) 794-0316

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ryan Thomas Ash Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6406239417
PECOS Enrollment IDI20220823003340
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 94304 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
$206.04 typical visit price
range $70.37 – $206.04
Typical copayment $51.51 (range $17.59 – $51.51)
Most-billed visit code 99205
Established Patient
$86.56 typical visit price
range $23.96 – $169.60
Typical copayment $21.64 (range $5.99 – $42.40)
Most-billed visit code 99213
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.

76.5/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality74.31
Promoting Interoperability100
Improvement Activities40
Cost43.95

Other Providers at the Same Location NPPES 20

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

RHEA MATHEW
Nurse Practitioner (Adult Health)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (209) 675-3787
JUSTIN AYALA BIRNBAUM M.D.
Psychiatry & Neurology (Psychiatry)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
MAHENDRA TAKASHI BHATI MD
Psychiatry & Neurology (Psychiatry)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
ANDREA ERIKA AMENT M.D.
Psychiatry & Neurology (Psychosomatic Medicine)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
CATHERINE BENEDICT PHD
Psychologist (Clinical)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
ARDEN MARIE MORRIS MD
Colon & Rectal Surgery
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
BENJAMIN ZEWDU BELAI MD
Psychiatry & Neurology (Psychiatry)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000
THEODORE LEE ROTH MD, PHD
Pathology (Anatomic Pathology)
300 PASTEUR DR
PALO ALTO, CA 94304
Santa Clara County (650) 723-4000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ryan Ash's NPI number?

The NPI number for Ryan Ash is 1023514411. It was assigned to this individual provider in the NPPES registry on April 4, 2018.

Where is Ryan Ash located?

Ryan Ash practices at 300 Pasteur Dr, Palo Alto, CA 94304. The listed phone number is (650) 723-4000.

What is Ryan Ash's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Ryan Ash enrolled in Medicare?

Yes. Ryan Ash is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ryan Ash was last updated on October 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.