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Internal Medicine

Melissa A. Frederick, MD

Sees patients in Millbrae, CA · California

Summary

Melissa A. Frederick, MD (Internal Medicine) is enrolled with Medicare at 1 practice location in Millbrae, CA. NPI 1033238076. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(510) 306‑4721 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Melissa A. Frederick, 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
Internal MedicinePrimary specialty
YesAccepts Medicare assignment
22Years since medical school (graduated 2004)
Medical College Of OhioMedical school
FemaleGender (as listed)
Acn Medical Group IncGroup practice

Quick answers

Where does Melissa A. Frederick see patients?
Medicare's clinician data lists 1 practice location in Millbrae, CA. Call before your visit to confirm the address.
What is Melissa A. Frederick's specialty?
Medicare lists Internal Medicine as the primary specialty, and also Cardiac Electrophysiology.
Does Melissa A. Frederick accept Medicare assignment?
Yes. Medicare's clinician data says Melissa A. Frederick 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 Melissa A. Frederick?
(510) 306-4721, as listed in official Medicare / NPI Registry data.
What is Melissa A. Frederick's NPI number?
1033238076. 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 Melissa A. Frederick is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists Melissa A. Frederick as a member of this group (CMS data updated 2026-10-02).

  • Acn Medical Group Inc2 clinicians in the group

Specialties

Find other Internal Medicine doctors in California →

Other internal medicine doctors in California

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

All internal medicine doctors in California →

Clinician information

CredentialMD
Medical schoolMedical College Of Ohio
Graduation year2004
Gender (as listed)Female
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1033238076
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