William Robert Mathias, PA-C
- Part D claims, 2024
- 337
- Industry payments
- $270
- Affiliated sites
- 2
- Medical group
- 1
- State licenses
- 2
- Practice address
- 460 Nrth Elm, Escondido, CA 92025
- Practice phone
- Call (760) 737-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Neighborhood Healthcare - Escondido Elm
FQHC - Main Site · Escondido, California
Find William Mathias' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
William Robert Mathias is a physician assistant in Escondido, California
William Mathias practices at Neighborhood Healthcare - Escondido Elm in Escondido, California.
William Mathias' NPI, 1285806323, was assigned on March 28, 2008. William Mathias holds California license 59627.
- NPI
- 1285806323NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375783129
- NPI enumeration date
- March 28, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (760) 737-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 30
- Medical school graduation
- 2022
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
William Robert Mathias practices at Neighborhood Healthcare - Escondido Elm in Escondido, California
William Mathias' primary practice is Neighborhood Healthcare - Escondido Elm, at 460 Nrth Elm, Escondido, CA 92025 in San Diego County. The practice phone is (760) 737-2000.
- Neighborhood Healthcare - Escondido Elm460 Nrth Elm, Escondido, CA 92025 · San Diego CountyPhone(760) 737-2000
Source: Dmand AI Affiliation Data
William Robert Mathias is affiliated with 2 sites of care and 1 medical group
William Mathias' primary practice is Neighborhood Healthcare - Escondido Elm in Escondido, California. The medical group on file is Neighborhood Healthcare. Dmand AI also links William Mathias to 1 more community health center, named with a free account. William Mathias' employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at William Robert Mathias' practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Mathias practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Neighborhood Healthcare - Escondido Elm | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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William Robert Mathias is one of 11,482 physician assistants in California
Physician assistant is William Mathias' primary specialty in the NPI Registry, under taxonomy code 363A00000X. Dmand AI has William Mathias' licenses on file in 2 states: California and Illinois.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
- Illinois license
Clinical focus
Dmand AI lists intellectual and developmental disabilities, joint pain, lower back pain and muscle pain, fibromyalgia, and limb pain among the conditions William Mathias treats.
Physician assistants near William Mathias
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
William Robert Mathias' patients have a median age of 47
Across all payers, Dmand AI patient panel data puts William Mathias' median patient age at 47, with 52% women.
William Mathias' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 47
Patient panel by sex, all payers
- Women52%
- Men47%
Source: Dmand AI Patient Panel Data
William Robert Mathias wrote 337 Medicare Part D claims in 2024
In 2024, William Mathias wrote 337 Medicare Part D claims for 114 patients. 84% of them were for generic drugs. CMS names the drug for 103 of them, across 7 drugs with 11 or more claims each, at $1,010 in total drug cost.
William Mathias' Part D claims by kind of drug, 2024
- Generic282 claims84%
- Brand-name and other55 claims16%
William Mathias' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in William Mathias' Part D claims, 2024
- Antibiotics4%15 of 337 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How William Robert Mathias takes part in Medicare
William Mathias accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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William Robert Mathias received $270 in industry payments from 2024 to 2025
CMS Open Payments shows 11 general payments to William Mathias from 8 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Eli Lilly and Company paid the most, $57.
General payments to William Mathias by program year, 2024 to 2025
Companies that paid William Mathias the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for William Robert Mathias's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about William Robert Mathias
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William Robert Mathias' NPI number?
William Robert Mathias' NPI number is 1285806323. It was assigned on March 28, 2008, and it is active in the NPI Registry.
What does William Robert Mathias specialize in?
William Robert Mathias is a physician assistant in Escondido, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does William Robert Mathias practice?
William Mathias practices at 460 Nrth Elm, Escondido, CA 92025. William Mathias' primary practice is Neighborhood Healthcare - Escondido Elm in Escondido, California. Dmand AI also links William Mathias to 1 community health center.
What is William Robert Mathias' office phone number?
The practice phone on file for William Mathias is (760) 737-2000.
What is William Robert Mathias' medical license number?
William Mathias holds California license 59627, one of the licenses on file in 2 states.
Which states has William Robert Mathias been licensed in?
Dmand AI has state licenses on file for William Mathias in California and Illinois.
What medical group is William Robert Mathias part of?
William Mathias is linked to Neighborhood Healthcare.
Does William Robert Mathias accept Medicare?
Yes. CMS lists William Mathias as accepting Medicare assignment.
What drugs does William Robert Mathias prescribe most?
In 2024 Medicare Part D data, William Mathias' most prescribed drugs by claims were Levothyroxine Sodium, Amlodipine Besylate and Metformin HCl.
Has William Robert Mathias received payments from drug or device companies?
CMS Open Payments shows $270 in general payments to William Mathias from 8 companies from 2024 to 2025. The largest total came from Eli Lilly and Company.
How long has William Robert Mathias been practicing?
William Mathias graduated from medical school in 2022, 4 years ago.
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