William H. Sierra, PA
Physician Assistant · West Islip, NY
William H. Sierra, PA is a physician assistant with a practice address in West Islip, New York, and NPI 1992721229, issued on Jul 13, 2006. Check the license (New York 002312, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William H. Sierra
- Credential
- PA
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 002312 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Montauk Hwy, West Islip, NY 11795
- Phone
- (631) 376-3000
- Enumerated
- Jul 13, 2006
- Record last updated
- May 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 15,555 in New York → Look up another NPI →
Also registered at 1000 Montauk Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William H. Sierra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license 002312Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average physician assistant in 2024
11 Medicare Part D claims, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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: $492.33
15 payments; by number, the most common kind was food and beverage; the largest payer was ALK-Abello, Inc. The 64,719 providers of this specialty with any payment received $841.65 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.
William H. Sierra among 15,555 physician assistant records in New York
William H. Sierra, PA is one of 15,555 physician assistant records with a practice address in New York. 74% 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 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 52% of these records are
- Record last updated2008 · 48% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
110 physician assistant records list a practice address in West Islip
They are 110 of the 1,107 NPPES records with a practice address in West Islip, and 15,555 physician assistant records in New York.
All 15,555 in New York → Every provider in West Islip → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Richard Declue, PAWest Islip, NY 117951093769416
- Frank Karp, PAWest Islip, NY 117951952345100
- Grazyna Kedzior, PAWest Islip, NY 117951457387193
- Charles Levinson, PAWest Islip, NY 117951962440834
- Matthew Love, PAWest Islip, NY 117951184652679
- Heather Lucido, PAWest Islip, NY 117951346295557
- Bonnie Metzger, PAWest Islip, NY 117951679501803
- Jennifer Miller, PAWest Islip, NY 117951871521302
Common questions
What is William H. Sierra, PA's NPI number?
William H. Sierra, PA's National Provider Identifier (NPI) is 1992721229, issued on Jul 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William H. Sierra, PA located?
The NPPES record lists a practice address at 1000 Montauk Hwy, West Islip, NY, 11795. Phone: (631) 376-3000. Providers update this record themselves, so call before visiting.
How can I verify William H. Sierra, PA's license?
NPPES lists New York license number 002312, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does William H. Sierra, PA prescribe under Medicare Part D?
In 2024, William H. Sierra, PA had 11 Medicare Part D claims; 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.