Appl Neuropsychol Adult
CriminalsHospitals, PsychiatricInpatients
Dr. Mark Williams, MD
NPI1306919584
- Part D claims, 2018
- 12
- Publications
- 2
- Industry payments
- $143
- Affiliated sites
- 1
- Medical groups
- 2
- Practice address
- 790 E Bonita Ave, Pomona, CA 91767
- Practice phone
- Call (909) 625-7207
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Pacific Clinics Bonita Family Center
Behavioral health practice · Pomona, California
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Mark Williams is a psychiatrist in Whittier, California
Dr. Williams practices at Pacific Clinics Bonita Family Center in Pomona, California.
Dr. Williams' NPI, 1306919584, was assigned on November 16, 2006. Dr. Williams graduated from Wayne State University School Of Medicine in 1992. Dr. Williams holds California license A74958.
NPI and contact details
- NPI
- 1306919584NPI Registry (opens in a new tab)
- NPI enumeration date
- November 16, 2006
- NPI status
- Active
- Practice phone
- (909) 625-7207
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Williams practices in Pomona and Whittier
Dr. Williams' primary practice is Pacific Clinics Bonita Family Center, at 790 E Bonita Ave, Pomona, CA 91767. The practice phone is (909) 625-7207. The NPI Registry lists Dr. Williams' practice address as 9080 Colima Rd, Whittier, CA 90605.
- Pacific Clinics Bonita Family CenterPrimary790 E Bonita Ave, Pomona, CA 91767Phone(909) 625-7207
- NPI Registry address9080 Colima Rd, Whittier, CA 90605 · Los Angeles CountyPhone(909) 623-6131
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Mark Williams is affiliated with 1 site of care and 2 medical groups
Dr. Williams' primary practice is Pacific Clinics Bonita Family Center in Pomona, California. The medical group on file is Pacific Clinics. Dmand AI also links Dr. Williams to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Mark Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pacific Clinics Bonita Family Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Williams is one of 6,803 psychiatrists in California
Psychiatry is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dmand AI has Dr. Williams' licenses on file in 2 states: California and Michigan.
Specialties and state licenses
- Psychiatry, CaliforniaPrimary
- Michigan license
Psychiatrists near Dr. Williams
Counts of psychiatrists with a Dmand AI profile, by place and practice. Each opens the list.
6,803psychiatrists in California
7psychiatrists in Whittier
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Williams' patients have a median age of 12
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 12, with 14% women.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 12
Patient panel by sex, all payers
- Women14%
- Men86%
Source: Dmand AI Patient Panel Data
Dr. Mark Williams wrote 12 Medicare Part D claims in 2018
In 2018, Dr. Williams wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $165 in total drug cost. In 2017, CMS named 23 claims across 2 drugs.
Part D claims, 201812
Drugs named by CMS1
Total drug cost$165
Dr. Williams' most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 232018: 1248%
Drugs named by CMS: 1 in 2018, 2 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Mark Williams has 2 publications on record
Dmand AI links 2 papers to Dr. Williams, published from 2016 to 2017. Dr. Williams' most frequent co-authors are Jordan D. Desautels, MD, David F. Skanchy and Mark Tony Williams, MD.
Papers2
Years published2016 to 2017
Dr. Williams' most frequent co-authors
- Jordan D. Desautels, MD1 shared paper
- David F. Skanchy1 shared paper
- Mark Tony Williams, MD1 shared paper
Recent publications by Dr. Williams
See who Dr. Williams researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williams works with, so you can find a warm path to the right psychiatrists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark Williams received $143 in industry payments from 2016 to 2019
CMS Open Payments shows 7 general payments to Dr. Williams from 1 drug or device company from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Sunovion Pharmaceuticals Inc. paid the most, $143.
General payments to Dr. Williams by program year, 2016 to 2019
Companies that paid Dr. Williams the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Williams graduated from Wayne State University School Of Medicine
Dr. Williams graduated from Wayne State University School Of Medicine in 1992.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Williams'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Dr. Mark Williams
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark Williams' NPI number?
Dr. Mark Williams' NPI number is 1306919584. It was assigned on November 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Williams?
Dr. Mark Williams is a psychiatrist in Whittier, California. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Mark Williams practice?
Dr. Williams practices at 790 E Bonita Ave, Pomona, CA 91767. Dr. Williams also practices at 9080 Colima Rd, Whittier, CA 90605. Dr. Williams' primary practice is Pacific Clinics Bonita Family Center in Pomona, California. Dmand AI also links Dr. Williams to 1 medical group.
What is Dr. Mark Williams' office phone number?
The practice phone on file for Dr. Williams is (909) 625-7207.
What is Dr. Mark Williams' medical license number?
Dr. Williams holds California license A74958, one of the licenses on file in 2 states.
Which states has Dr. Mark Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in California (2001 to 2027) and Michigan (1997 to 2025).
What medical group is Dr. Mark Williams part of?
Dr. Williams is linked to Pacific Clinics. Dmand AI links Dr. Williams to 1 more medical group.
Where did Dr. Mark Williams go to medical school?
Dr. Williams graduated from Wayne State University School Of Medicine in 1992.
What drugs does Dr. Mark Williams prescribe most?
In 2018 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Fenofibrate.
Has Dr. Mark Williams received payments from drug or device companies?
CMS Open Payments shows $143 in general payments to Dr. Williams from 1 company from 2016 to 2019. The largest total came from Sunovion Pharmaceuticals Inc.
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How long has Dr. Mark Williams been practicing?
Dr. Williams graduated from medical school in 1992, 34 years ago.
Does Dr. Mark Williams do research?
Dmand AI links 2 publications to Dr. Williams, published from 2016 to 2017.
Who does Dr. Mark Williams publish with?
Dr. Williams' most frequent co-authors are Jordan D. Desautels, MD (1 shared paper), David F. Skanchy (1 shared paper) and Mark Tony Williams, MD (1 shared paper).
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