William O. Hartzell, M.D.
Pulmonary Disease Physician · Westborough, MA
William O. Hartzell, M.D. is a pulmonary disease physician with a practice address in Westborough, Massachusetts, and NPI 1417938986, issued on Nov 10, 2005. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- William O. Hartzell
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 0101239857 VA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Flanders RD, Westborough, MA 01581
- Phone
- (508) 871-2000
- Enumerated
- Nov 10, 2005
- Record last updated
- Feb 18, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 0164861 MA
- Medicare enrollment
- Enrolled (PECOS I20061025000541); may accept Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 1992
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 569 in Massachusetts → Look up another NPI →
Also registered at 150 Flanders RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Toshal Hallowell, RPHPharmacist1619861937
- Michael Hoang, PHARMDPharmacist1770108250
- Jaroslaw Jac, MDHematology & Oncology Physician1326029802
- Samina Khan, MA, CCC-AAudiologist1619116308
- Gregory Malloy, M.D.Physical Medicine & Rehabilitation Physician1427164342
- Jennifer Martin, MPTPhysical Therapist1487948766
Verify William O. Hartzell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average pulmonary disease physician in 2024
1,074 Medicare Part D claims for 154 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D. Brand-name drugs were 46% of claims.
Most prescribed
- Trelegy Ellipta177 claims
- Montelukast Sodium148 claims
- Prednisone142 claims
- Albuterol Sulfate Hfa90 claims
- Fluticasone-Salmeterol58 claims
- Breztri Aerosphere57 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: $33.78
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,806 providers of this specialty with any payment received $5,159.88 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 O. Hartzell among 569 pulmonary disease physician records in Massachusetts
William O. Hartzell, M.D. is one of 569 pulmonary disease physician records with a practice address in Massachusetts. 82% 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, 84% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1992 · median 2003 among the 407 with a school on file
- Record last updated2019 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in Massachusetts
There are 569 pulmonary disease physician records in Massachusetts.
All 569 in Massachusetts → Every provider in Westborough → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Mohsen Noreldin, MDWestborough, MA 015811699765776
- Steven Davis, M.D.Worcester, MA 016051528041159
- Abdo Kataya, M.D.Worcester, MA 016051851598478
- Oren Schaefer, M.D.Worcester, MA 016051649252065
- Bharat BhandariWorcester, MA 016081215450606
- Yaron Goldman, MDWorcester, MA 016081649499823
- Kevin Martin, MDWorcester, MA 016081124107123
- Richard Rosiello, MDWorcester, MA 016081992739791
Common questions
What is William O. Hartzell, M.D.'s NPI number?
William O. Hartzell, M.D.'s National Provider Identifier (NPI) is 1417938986, issued on Nov 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William O. Hartzell, M.D. located?
The NPPES record lists a practice address at 150 Flanders RD, Westborough, MA, 01581. Phone: (508) 871-2000. Providers update this record themselves, so call before visiting.
How can I verify William O. Hartzell, M.D.'s license?
Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William O. Hartzell, M.D. prescribe under Medicare Part D?
In 2024, William O. Hartzell, M.D. had 1,074 Medicare Part D claims for 154 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. 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.