Holly Gabriella Maccallum, M.D.
Neurology Physician · Fremont, CA
Holly Gabriella Maccallum, M.D. is a neurology physician with a practice address in Fremont, California, and NPI 1518225788, issued on Apr 25, 2012. Check the license (California A136396, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Holly Gabriella Maccallum
- Credential
- M.D.
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- A136396 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3200 Kearney St, Fremont, CA 94538
- Phone
- (510) 490-1222
- Enumerated
- Apr 25, 2012
- Record last updated
- May 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170404001602); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 2,339 in California → Look up another NPI →
Also registered at 3200 Kearney St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jia Afnan, PAPhysician Assistant1376763698
- Jessica Aldaz, FNPFamily Nurse Practitioner1740467174
- Neha AnandFamily Medicine Physician1477810836
- Lauren Auerbach, MDEmergency Medicine Physician1033678990
- Ritika Aulakh, D.OFamily Medicine Physician1346335072
- Rupal Badani, M.D.Pediatrics Physician1598857765
Verify Holly Gabriella Maccallum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A136396Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average neurology physician in 2024
1,069 Medicare Part D claims for 198 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Donepezil Hcl112 claims
- Levetiracetam94 claims
- Gabapentin78 claims
- Carbidopa-Levodopa75 claims
- Memantine Hcl64 claims
- Sumatriptan Succinate48 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationFremont, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Holly Gabriella Maccallum among 2,339 neurology physician records in California
Holly Gabriella Maccallum, M.D. is one of 2,339 neurology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 66% of them.
- NPI issued2012 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2011 · median 2006 among the 1,628 with a school on file
- Record last updated2020 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in California
There are 2,339 neurology physician records in California.
All 2,339 in California → Every provider in Fremont → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Alok Bhattacharya, M.D.Fremont, CA 945381528092996
- Nayan Desai, MDFremont, CA 945381710953773
- Jina Janavs, MDFremont, CA 945381063597722
- Joy Lin, MDFremont, CA 945381528593902
- Stephen Nnodim, MDFremont, CA 945381396199105
- John Ribaudo, MDFremont, CA 945381598844649
- Charan Singh, M.D.Fremont, CA 945381821046319
- Ravinder Kahlon, M.D.Fremont, CA 945361386741320
Common questions
What is Holly Gabriella Maccallum, M.D.'s NPI number?
Holly Gabriella Maccallum, M.D.'s National Provider Identifier (NPI) is 1518225788, issued on Apr 25, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Holly Gabriella Maccallum, M.D. located?
The NPPES record lists a practice address at 3200 Kearney St, Fremont, CA, 94538. Phone: (510) 490-1222. Providers update this record themselves, so call before visiting.
How can I verify Holly Gabriella Maccallum, M.D.'s license?
NPPES lists California license number A136396, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Holly Gabriella Maccallum, M.D. prescribe under Medicare Part D?
In 2024, Holly Gabriella Maccallum, M.D. had 1,069 Medicare Part D claims for 198 beneficiaries; the average among neurology physician prescribers was 1,370. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.