Dalia M. Nassman, D.O.
Emergency Medicine Physician · Upland, CA
Dalia M. Nassman, D.O. is an emergency medicine physician with a practice address in Upland, California, and NPI 1639410921, issued on Mar 12, 2013. Check the license (California 20A13662, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Dalia M. Nassman
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A13662 CA
Self-reported in NPPES; status is on the state search - Practice location
- 999 San Bernardino RD, Upland, CA 91786
- Phone
- (909) 985-2811
- Enumerated
- Mar 12, 2013
- Record last updated
- Jan 2, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180301001439); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 999 San Bernardino RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Donald Alpiner, DOSurgery Physician1811086952
- Alexander ArzooStudent in an Organized Health Care Education/Training Program1891635629
- Liezl Avila, D.O.Emergency Medicine Physician1487064515
Verify Dalia M. Nassman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A13662Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average emergency medicine physician in 2024
280 Medicare Part D claims for 194 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Cephalexin46 claims
- Ibuprofen42 claims
- Ondansetron Odt37 claims
- Hydrocodone-Acetaminophen28 claims
- Metoclopramide Hcl23 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: $86.00
1 payment: food and beverage; the largest payer was Penumbra, Inc. The 12,335 providers of this specialty with any payment received $953.79 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
- Mountain View Emergency Physicians Medical Group IncUpland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dalia M. Nassman among 7,751 emergency medicine physician records in California
Dalia M. Nassman, D.O. is one of 7,751 emergency 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 2013, is newer than 66% of them.
- NPI issued2013 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2013 · median 2011 among the 4,560 with a school on file
- Record last updated2019 · 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 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Upland → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Allan Bock, MDUpland, CA 917861366462830
- Anthony Cabrera, DOUpland, CA 917861114161007
- Heather Crane, MDUpland, CA 917861205859063
- Steven Ernst, MDUpland, CA 917861568485324
- James Fisgus, MDUpland, CA 917861902829765
- Scott Miller, M.D.Upland, CA 917861851367734
- Kevin Parkes, MDUpland, CA 917861013938711
- Larry Potts, MDUpland, CA 917861679596191
Common questions
What is Dalia M. Nassman, D.O.'s NPI number?
Dalia M. Nassman, D.O.'s National Provider Identifier (NPI) is 1639410921, issued on Mar 12, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Dalia M. Nassman, D.O. located?
The NPPES record lists a practice address at 999 San Bernardino RD, Upland, CA, 91786. Phone: (909) 985-2811. Providers update this record themselves, so call before visiting.
How can I verify Dalia M. Nassman, D.O.'s license?
NPPES lists California license number 20A13662, 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 Dalia M. Nassman, D.O. prescribe under Medicare Part D?
In 2024, Dalia M. Nassman, D.O. had 280 Medicare Part D claims for 194 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.