Donald A. Underwood, DO MD
Family Medicine Physician · San Bernardino, CA
Donald A. Underwood, DO MD is a family medicine physician with a practice address in San Bernardino, California, and NPI 1598861817, issued on Sep 15, 2006. Check the license (California 20A4681, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Donald A. Underwood
- Credential
- DO MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A4681 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1963 North E Street, San Bernardino, CA 92405
- Phone
- (909) 881-6146
- Enumerated
- Sep 15, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (909) 881-0111
- Medicaid ID
- FHC70520F CA
- Medicare enrollment
- Enrolled (PECOS I20150227000357); accepts Medicare assignment
- Medical or professional school
- College Of Medicine And Surgery, 1974
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1963 North E Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Wilma Shepard, LCSWClinical Social Worker1225156797
- Danielle SnaggAddiction (Substance Use Disorder) Counselor1588187850
Verify Donald A. Underwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4681Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% more Medicare Part D claims than the average family medicine physician in 2024
4,655 Medicare Part D claims for 235 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 260 claims were for opioids.
Most prescribed
- Albuterol Sulfate Hfa210 claims
- Metformin Hcl164 claims
- Amlodipine Besylate160 claims
- Lisinopril146 claims
- Gabapentin140 claims
- Atorvastatin Calcium134 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.
Industry payments in 2024: $19.35
1 payment: food and beverage; the largest payer was Dexcom, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Inland Behavioral And Health Services IncSan Bernadino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Donald A. Underwood among 17,133 family medicine physician records in California
Donald A. Underwood, DO MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1974 · median 2005 among the 10,652 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
76 family medicine physician records list a practice address in San Bernardino
They are 76 of the 5,645 NPPES records with a practice address in San Bernardino, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Bernardino → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Sachin Chatta, M.D.San Bernardino, CA 924051063906709
- Percy Ramos, MDSan Bernardino, CA 924051255368809
- Maria Ruiz-RodriguezSan Bernardino, CA 924051356846281
- Anooshirvan Bozorgmehr, DOSan Bernardino, CA 924041689019200
- Ponteah Damirchi, MDSan Bernardino, CA 924041134861339
- Julius Daniels, MDSan Bernardino, CA 924041386221661
- Shanti Dewar, MDSan Bernardino, CA 924041912068271
- Mark Ilagan, D.O.San Bernardino, CA 924041710326749
Common questions
What is Donald A. Underwood, DO MD's NPI number?
Donald A. Underwood, DO MD's National Provider Identifier (NPI) is 1598861817, issued on Sep 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Donald A. Underwood, DO MD located?
The NPPES record lists a practice address at 1963 North E Street, San Bernardino, CA, 92405. Phone: (909) 881-6146. Providers update this record themselves, so call before visiting.
How can I verify Donald A. Underwood, DO MD's license?
NPPES lists California license number 20A4681, 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 Donald A. Underwood, DO MD prescribe under Medicare Part D?
In 2024, Donald A. Underwood, DO MD had 4,655 Medicare Part D claims for 235 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.