DR. DAVID W. RALSTON M.D.
NPI 1861537565
Internal Medicine in San Luis Obispo, CA

Q: What is David Ralston's NPI number?

The NPI number for David Ralston is 1861537565. It was assigned to this individual provider in the NPPES registry on February 20, 2007.

Q: What is David Ralston's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: Is David Ralston enrolled in Medicare?

No. David Ralston has opted out of Medicare through March 26, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for David Ralston was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.

Active since February 20, 2007Opted out of Medicare · through Mar 26, 2027

1 GRAND AVE, CAL POLY STUDENT HEALTH SERVICES, SAN LUIS OBISPO, CA 93407(805) 756-1211(805) 756-5286 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Dr. David W. Ralston M.d. NPPES

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

DR. DAVID W. RALSTON M.D. (NPI 1861537565) is an individual internal medicine provider in San Luis Obispo, California, licensed in California (G32733) and active in the NPI registry since February 2007. He has opted out of Medicare through March 26, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1861537565

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. DAVID W. RALSTONCredential: M.D.

Location Address1 GRAND AVE, CAL POLY STUDENT HEALTH SERVICESSan Luis Obispo, CA 93407-9000

Mailing Address1 Grand Ave, Cal Poly Student Health ServicesSan Luis Obispo, CA 93407-9000 · (805) 756-1211 · Fax (805) 756-5286

Phone(805) 756-1211

Fax(805) 756-5286

Sole ProprietorNo

Enumeration DateFebruary 20, 2007

Last NPPES UpdateJuly 8, 2007

✔ NPI 1861537565 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CA · G32733

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1 GRAND AVE, San Luis Obispo, CA 93407

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Other Identifiers 1

Medicare UPINA45265CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. David W. Ralston M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from March 26, 2023 through March 26, 2027.

Opt-Out Effective DateMarch 26, 2023

Opt-Out In Effect ThroughMarch 26, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93407 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

$135.73 typical visit price

range $59.84 – $178.89

Typical copayment $33.93 (range $14.96 – $44.72)

Most-billed visit code 99204

Established Patient

$104.82 typical visit price

range $19.70 – $146.55

Typical copayment $26.20 (range $4.92 – $36.63)

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.

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.

DR. JAY BETTERGARCIA PH.D.

Psychologist (Counseling)

1 GRAND AVE
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 225-6406

MR. KEVIN MCCARTHY

General Practice

1 GRAND AVE
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-1211

DR. JOHN EVERETT GARCIA M.D

Emergency Medicine

1 GRAND AVE, CALIFORNIA POLYTECHNIC UNIVERSITY
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-5373

DR. RICHARD V ASCOLI M.D.

Family Medicine

1 GRAND AVE
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-1211

DR. AARON GORDON BAKER M.D.

Emergency Medicine

1 GRAND AVE, CAMPUS HEALTH AND WELL BEING BLDG 27
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-1211

MR. PAUL ERIC GABRIELSON MA, ATC

Specialist/Technologist (Athletic Trainer)

1 GRAND AVE, ATHLETICS
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-2096

PATRICIA FRANCO ROBINSON MD

Family Medicine

1 GRAND AVE
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-1211

STEPHANIE UYENO

Specialist/Technologist (Athletic Trainer)

1 GRAND AVE
SAN LUIS OBISPO, CA 93407

San Luis Obispo County (805) 756-5422

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 David Ralston's NPI number?

The NPI number for David Ralston is 1861537565. It was assigned to this individual provider in the NPPES registry on February 20, 2007.

Where is David Ralston located?

David Ralston practices at 1 Grand Ave Cal Poly Student Health Services, San Luis Obispo, CA 93407. The listed phone number is (805) 756-1211.

What is David Ralston's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is David Ralston enrolled in Medicare?

No. David Ralston has opted out of Medicare through March 26, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for David Ralston was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.