Christopher Ray Williams, PA-C
Physician Assistant · Fontana, CA
Christopher Ray Williams, PA-C is a physician assistant with a practice address in Fontana, California, and NPI 1396992939, issued on Aug 26, 2008. Check the license (California PA19866, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Christopher Ray Williams
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA19866 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16465 Sierra Lakes Pkwy, Fontana, CA 92336
- Phone
- (909) 429-2864
- Enumerated
- Aug 26, 2008
- Record last updated
- Aug 26, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100724000238); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 16465 Sierra Lakes Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Adriana Cornejo, CPNPPediatrics Physician1790201283
- Lauren Crostic, PA-CPhysician Assistant1215385448
- Maged Ibrahim, M.D.Pediatrics Physician1306852934
- Michelle Laksana, PA-CPhysician Assistant1851709414
Verify Christopher Ray Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA19866Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average physician assistant in 2024
67 Medicare Part D claims for 51 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Tramadol Hcl11 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 2 group practices
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
- Mountain View Urgent Care Group IncFontana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher Ray Williams among 14,451 physician assistant records in California
Christopher Ray Williams, PA-C is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 22% of them.
- NPI issued2008 · 22% of these records are older, 75% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2008 · median 2018 among the 7,214 with a school on file
- Record last updated2008 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
97 physician assistant records list a practice address in Fontana
They are 97 of the 3,012 NPPES records with a practice address in Fontana, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Fontana → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Martha Ajca, P.A.CFontana, CA 923361396175758
- Yaw Asamoah, PA-CFontana, CA 923361083917439
- Khristine Marie Bueno, PA-CFontana, CA 923361811356439
- Giuliana Cilliani, PA-CFontana, CA 923361043504913
- Lauren Crostic, PA-CFontana, CA 923361215385448
- Natalie Herrera, PA-CFontana, CA 923361407237498
- Emanuel Jean-Pierre, PA-CFontana, CA 923361649306457
- Michelle Laksana, PA-CFontana, CA 923361851709414
Common questions
What is Christopher Ray Williams, PA-C's NPI number?
Christopher Ray Williams, PA-C's National Provider Identifier (NPI) is 1396992939, issued on Aug 26, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Ray Williams, PA-C located?
The NPPES record lists a practice address at 16465 Sierra Lakes Pkwy, Fontana, CA, 92336. Phone: (909) 429-2864. Providers update this record themselves, so call before visiting.
How can I verify Christopher Ray Williams, PA-C's license?
NPPES lists California license number PA19866, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Christopher Ray Williams, PA-C prescribe under Medicare Part D?
In 2024, Christopher Ray Williams, PA-C had 67 Medicare Part D claims for 51 beneficiaries; the average among physician assistant prescribers was 830. 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.