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General Practice

Gregory C. Mattson, MD

Sees patients in La Jolla, CA · California

Summary

Gregory C. Mattson, MD (General Practice) is enrolled with Medicare at 1 practice location in La Jolla, CA. NPI 1922155282. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(858) 454‑6141 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Gregory C. Mattson, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
General PracticePrimary specialty
YesAccepts Medicare assignment
51Years since medical school (graduated 1975)
University Of California, San Diego School Of MedicineMedical school
MaleGender (as listed)

Quick answers

Where does Gregory C. Mattson see patients?
Medicare's clinician data lists 1 practice location in La Jolla, CA. Call before your visit to confirm the address.
What is Gregory C. Mattson's specialty?
Medicare lists General Practice as the primary specialty, and also Emergency Medicine.
Does Gregory C. Mattson accept Medicare assignment?
Yes. Medicare's clinician data says Gregory C. Mattson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for Gregory C. Mattson?
(858) 454-6141, as listed in official Medicare / NPI Registry data.
What is Gregory C. Mattson's NPI number?
1922155282. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Gregory C. Mattson is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other General Practice doctors in California →

Other general practitioners in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

All general practitioners in California →

Clinician information

CredentialMD
Medical schoolUniversity Of California, San Diego School Of Medicine
Graduation year1975
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1922155282
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians