Zachary Saxe Sager, M.D.
Hospice and Palliative Medicine (Psychiatry & Neurology) Physician · Boston, MA
Zachary Saxe Sager, M.D. is a hospice and palliative medicine (psychiatry & neurology) physician with a practice address in Boston, Massachusetts, and NPI 1396183125, issued on Jun 14, 2013. Check the license (Massachusetts 271243, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Zachary Saxe Sager
- Credential
- M.D.
- Primary taxonomy
- Hospice and Palliative Medicine (Psychiatry & Neurology) Physician 2084H0002X
- License number
- 271243 MA
Self-reported in NPPES; status is on the state search - Practice location
- 450 Brookline Ave, Boston, MA 02215
- Phone
- (617) 632-6464
- Enumerated
- Jun 14, 2013
- Record last updated
- Apr 11, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (617) 632-6180
- Medicare enrollment
- Enrolled (PECOS I20171016000211); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
1 nearest hospice and palliative medicine (psychiatry & neurology) physician record → All 2 in Massachusetts → Look up another NPI →
Also registered at 450 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gregory Abel, MDHematology & Oncology Physician1285611954
- Lara Abousamra, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1851183404
- Karley Adams, PAPhysician Assistant1578261764
- Lauren Adams, PA-CPhysician Assistant1902763469
- Ana Aguilar-Bonilla, M.D.Pediatric Hematology & Oncology Physician1023319761
- Andrew Aguirre, MD, PHDMedical Oncology Physician1609071208
Verify Zachary Saxe Sager in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 271243Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
About as many Medicare Part D claims as the average hospice and palliative medicine (psychiatry & neurology) physician in 2024
632 Medicare Part D claims for 138 beneficiaries, against an average of 629 among the 18 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 337 claims were for opioids.
Most prescribed
- Oxycodone Hcl116 claims
- Pregabalin67 claims
- Buprenorphine59 claims
- Hydromorphone Hcl47 claims
- Morphine Sulfate Er39 claims
- Gabapentin28 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
- Dana-Farber Cancer Institute, Inc.Boston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hospice and Palliative Medicine (Psychiatry & Neurology) Physician providers in Massachusetts
There are 2 hospice and palliative medicine (psychiatry & neurology) physician records in Massachusetts.
All 2 in Massachusetts → Every provider in Boston → Hospice and Palliative Medicine (Psychiatry & Neurology) Physician nationwide →
The 1 hospice and palliative medicine (psychiatry & neurology) physician record with the nearest ZIP codes
- Alden Doerner Rinaldi, MDBoston, MA 021141477845857
Common questions
What is Zachary Saxe Sager, M.D.'s NPI number?
Zachary Saxe Sager, M.D.'s National Provider Identifier (NPI) is 1396183125, issued on Jun 14, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Saxe Sager, M.D. located?
The NPPES record lists a practice address at 450 Brookline Ave, Boston, MA, 02215. Phone: (617) 632-6464. Providers update this record themselves, so call before visiting.
How can I verify Zachary Saxe Sager, M.D.'s license?
NPPES lists Massachusetts license number 271243, as entered by the provider. 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 Zachary Saxe Sager, M.D. prescribe under Medicare Part D?
In 2024, Zachary Saxe Sager, M.D. had 632 Medicare Part D claims for 138 beneficiaries; the average among hospice and palliative medicine (psychiatry & neurology) physician prescribers was 629. 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.