William Baek, M.D..
NPI 1326095977 · Neurology Physician · Upland, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Baek, M.D.. is a Neurology Physician provider in Upland, CA (NPI 1326095977).
Provider details
- NPI number
- 1326095977
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D..
- Sex
- Male
- Sole proprietor
- No
- License
- A91283 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 55 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Donepezil Hcl | 303 | 121 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 209 | 61 |
| Levetiracetam | 196 | 54 |
| Memantine Hcl | 183 | 53 |
| Citalopram Hydrobromidebrand: Citalopram Hbr | 173 | 60 |
| Gabapentin | 145 | 66 |
| Rizatriptan Benzoatebrand: Rizatriptan | 119 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$13,531 across 149 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-28
- Last updated
- 2012-02-06
Frequently asked questions
- What is William Baek's NPI number?
- William Baek's National Provider Identifier (NPI) is 1326095977, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Baek's specialty?
- William Baek is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is William Baek located?
- William Baek's practice location on file with NPPES is 630 N 13th Ave, Upland, CA 91786-4975.
- What is William Baek's phone number?
- The practice phone number listed in the NPPES registry for William Baek is (909) 982-2719.
- Does William Baek accept Medicare?
- William Baek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Baek's NPI active?
- Yes — William Baek's NPI (1326095977) is active in the NPPES registry as of the last update on 2012-02-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.