Douglas K. Mack, MD
Physical Medicine & Rehabilitation Physician · Fontana, CA
Douglas K. Mack, MD is a physical medicine & rehabilitation physician with a practice address in Fontana, California, and NPI 1124195045, issued on Nov 29, 2006. Check the license (California A65889, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Douglas K. Mack
- Credential
- MD
- Primary taxonomy
- Physical Medicine & Rehabilitation Physician 208100000X
- License number
- A65889 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-3910
- Enumerated
- Nov 29, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090106000583); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physical medicine & rehabilitation physician records → All 1,549 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Adair, MDFamily Medicine Physician1780732651
- Berneva Adams, MDObstetrics & Gynecology Physician1376602987
Verify Douglas K. Mack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A65889Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average physical medicine & rehabilitation physician in 2024
105 Medicare Part D claims for 80 beneficiaries, against an average of 727 among the 7,448 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Prednisone33 claims
- Gabapentin23 claims
- Diazepam13 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 one group practice
- Southern California Permanente Medical GroupOntario, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Douglas K. Mack among 1,549 physical medicine & rehabilitation physician records in California
Douglas K. Mack, MD is one of 1,549 physical medicine & rehabilitation physician records with a practice address in California. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 70% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated1996 · median 2008 among the 786 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208100000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physical Medicine & Rehabilitation Physician providers in California
There are 1,549 physical medicine & rehabilitation physician records in California.
All 1,549 in California → Every provider in Fontana → Physical Medicine & Rehabilitation Physician nationwide →
The 8 physical medicine & rehabilitation physician records with the nearest ZIP codes
- Adrianne Beck, MDFontana, CA 923351285773986
- Ha Sarreong Cillpame, DPTFontana, CA 923351780549311
- Christine Diaz, M.D.Fontana, CA 923351306032537
- Gerald Goodlow, MDFontana, CA 923351396884094
- Mustafa Khan, M.D.Fontana, CA 923351710253430
- Herbert Lee, MDFontana, CA 923351689723900
- Chakradhar Penta, MD, BSFontana, CA 923351689881039
- John Shen, MDFontana, CA 923351346398336
Common questions
What is Douglas K. Mack, MD's NPI number?
Douglas K. Mack, MD's National Provider Identifier (NPI) is 1124195045, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Douglas K. Mack, MD located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-3910. Providers update this record themselves, so call before visiting.
How can I verify Douglas K. Mack, MD's license?
NPPES lists California license number A65889, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Douglas K. Mack, MD prescribe under Medicare Part D?
In 2024, Douglas K. Mack, MD had 105 Medicare Part D claims for 80 beneficiaries; the average among physical medicine & rehabilitation physician prescribers was 727. 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.