Sienna Contreras, PA-C
Physician Assistant · Gilbert, AZ
Sienna Contreras, PA-C is a physician assistant with a practice address in Gilbert, Arizona, and NPI 1720749377, issued on Jan 5, 2022. Check the license (Arizona 10012, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sienna Contreras
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 10012 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1675 E Melrose St Ste 101-103, Gilbert, AZ 85297
- Phone
- (602) 648-5444
- Enumerated
- Jan 5, 2022
- Record last updated
- Mar 28, 2025
- Fax
- (602) 772-3801
- Medicare enrollment
- Enrolled (PECOS I20231212003341); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,666 in Arizona → Look up another NPI →
Also registered at 1675 E Melrose St Ste 101-103
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Sienna Contreras in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license 10012Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average physician assistant in 2024
84 Medicare Part D claims for 58 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass13 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
- Orthopedic Specialists OF North America PLLCScottsdale, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sienna Contreras among 3,666 physician assistant records in Arizona
Sienna Contreras, PA-C is one of 3,666 physician assistant records with a practice address in Arizona. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 70% of them.
- NPI issued2022 · 70% of these records are older, 23% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2023 · median 2018 among the 2,207 with a school on file
- Record last updated2025 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
237 physician assistant records list a practice address in Gilbert
They are 237 of the 5,802 NPPES records with a practice address in Gilbert, and 3,666 physician assistant records in Arizona.
All 3,666 in Arizona → Every provider in Gilbert → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Jonathan Bolles, PA-CGilbert, AZ 852971316183338
- Katrina Gaines, PA-CGilbert, AZ 852971285943654
- Olena Grigutis, PAGilbert, AZ 852971659739704
- Jon Holden, PA-CGilbert, AZ 852971174022198
- Krystina Holloran, P.A.-CGilbert, AZ 852971417973066
- Jesse Lyon, PAGilbert, AZ 852971013431188
- Donald Morgenson, PA-SGilbert, AZ 852971598216434
- Sylvia Phommalinh, PA-CGilbert, AZ 852971598240731
Common questions
What is Sienna Contreras, PA-C's NPI number?
Sienna Contreras, PA-C's National Provider Identifier (NPI) is 1720749377, issued on Jan 5, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Sienna Contreras, PA-C located?
The NPPES record lists a practice address at 1675 E Melrose St Ste 101-103, Gilbert, AZ, 85297. Phone: (602) 648-5444. Providers update this record themselves, so call before visiting.
How can I verify Sienna Contreras, PA-C's license?
NPPES lists Arizona license number 10012, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Sienna Contreras, PA-C prescribe under Medicare Part D?
In 2024, Sienna Contreras, PA-C had 84 Medicare Part D claims for 58 beneficiaries; the average among physician assistant prescribers was 830. 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.