William A. Gaspar, MD
Internal Medicine Physician · Chandler, AZ
William A. Gaspar, MD is an internal medicine physician with a practice address in Chandler, Arizona, and NPI 1497739015, issued on Dec 6, 2005. Check the license (Arizona 68691, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William A. Gaspar
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 68691 AZ
96251 NM
Self-reported in NPPES; status is on the state search - Practice location
- 1860 S Alma School RD, Chandler, AZ 85286
- Phone
- (480) 361-1955
- Enumerated
- Dec 6, 2005
- Record last updated
- Mar 2, 2026
- Medicaid ID
- 000L5164 NM
- Medicare enrollment
- Enrolled (PECOS I20081103000125); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Verify William A. Gaspar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 68691Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
368 Medicare Part D claims for 167 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Cefuroxime24 claims
- Amoxicillin-Clavulanate Potass21 claims
- Levofloxacin21 claims
- Hydrocodone-Acetaminophen20 claims
- Tamsulosin Hcl17 claims
- Finasteride16 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
- Las Cruces HB Medical Services LLCLas Cruces, NM
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William A. Gaspar among 2,853 internal medicine physician records in Arizona
William A. Gaspar, MD is one of 2,853 internal medicine physician records with a practice address in Arizona. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1991 · median 2003 among the 1,643 with a school on file
- Record last updated2026 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
93 internal medicine physician records list a practice address in Chandler
They are 93 of the 5,497 NPPES records with a practice address in Chandler, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Chandler → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Osaf Ahmed, MDChandler, AZ 852861396775680
- Kent Allen, MDChandler, AZ 852861750341137
- Amanda Bailey, D.O.Chandler, AZ 852861750837456
- Lynn CamargoChandler, AZ 852861093169534
- Hemasree Chaliki, MDChandler, AZ 852861356333454
- Shalini Chaliki, M.D.Chandler, AZ 852861659804433
- Megan Jhaver, M.D.Chandler, AZ 852861639115561
- Mei Liu, MDChandler, AZ 852861538336292
Common questions
What is William A. Gaspar, MD's NPI number?
William A. Gaspar, MD's National Provider Identifier (NPI) is 1497739015, issued on Dec 6, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William A. Gaspar, MD located?
The NPPES record lists a practice address at 1860 S Alma School RD, Chandler, AZ, 85286. Phone: (480) 361-1955. Providers update this record themselves, so call before visiting.
How can I verify William A. Gaspar, MD's license?
NPPES lists Arizona license number 68691, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William A. Gaspar, MD prescribe under Medicare Part D?
In 2024, William A. Gaspar, MD had 368 Medicare Part D claims for 167 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.