Holly Maccallum, M.D.
NPI 1518225788 · Neurology Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Holly Maccallum, M.D. is a Neurology Physician provider in Fremont, CA (NPI 1518225788).
Provider details
- NPI number
- 1518225788
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
585 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 229 | $153 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 199 | $19 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 78 | $214 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 42 | $198 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 21 | $108 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Donepezil Hcl | 112 | 36 |
| Levetiracetam | 94 | 25 |
| Gabapentin | 78 | 30 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 75 | 28 |
| Memantine Hcl | 64 | 23 |
| Sumatriptan Succinate | 48 | — |
| Lacosamide | 43 | — |
| Quetiapine Fumarate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-04-25
- Last updated
- 2020-05-29
- Certified
- 2020-05-29
Frequently asked questions
- What is Holly Maccallum's NPI number?
- Holly Maccallum's National Provider Identifier (NPI) is 1518225788, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Holly Maccallum's specialty?
- Holly Maccallum is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Holly Maccallum located?
- Holly Maccallum's practice location on file with NPPES is 3200 Kearney St, Fremont, CA 94538-2299.
- What is Holly Maccallum's phone number?
- The practice phone number listed in the NPPES registry for Holly Maccallum is (510) 490-1222.
- Does Holly Maccallum accept Medicare?
- Holly Maccallum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Holly Maccallum's NPI active?
- Yes — Holly Maccallum's NPI (1518225788) is active in the NPPES registry as of the last update on 2020-05-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.