William Hartzell, M.D.
NPI 1417938986 · Pulmonary Disease Physician · Westborough, MA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Hartzell, M.D. is a Pulmonary Disease Physician provider in Westborough, MA (NPI 1417938986).
Provider details
- NPI number
- 1417938986
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 0101239857 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
607 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 325 | $134 |
| Test to Measure Rate of Airflow94375 | 161 | $42 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 47 | $175 |
| Test to Determine Lung Volumes Using Sensors94726 | 27 | $36 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 25 | $62 |
| Test to Measure Expiratory Airflow and Volume94010 | 22 | $30 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 177 | 41 |
| Montelukast Sodium | 148 | 39 |
| Prednisone | 142 | 47 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 90 | 45 |
| Fluticasone Propion/Salmeterolbrand: Fluticasone-Salmeterol | 58 | — |
| Budesonide/Glycopyr/Formoterolbrand: Breztri Aerosphere | 57 | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$34 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-10
- Last updated
- 2019-02-18
Frequently asked questions
- What is William Hartzell's NPI number?
- William Hartzell's National Provider Identifier (NPI) is 1417938986, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Hartzell's specialty?
- William Hartzell is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Hartzell located?
- William Hartzell's practice location on file with NPPES is 150 Flanders Rd, Westborough, MA 01581-1017.
- What is William Hartzell's phone number?
- The practice phone number listed in the NPPES registry for William Hartzell is (508) 871-2000.
- Does William Hartzell accept Medicare?
- William Hartzell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Hartzell's NPI active?
- Yes — William Hartzell's NPI (1417938986) is active in the NPPES registry as of the last update on 2019-02-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.