Walter Joseph O'Donnell, MD
Critical Care Medicine (Internal Medicine) Physician · Boston, MA
Walter Joseph O'Donnell, MD is a critical care medicine (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1356320758, issued on Jan 13, 2006. Check the license (Massachusetts 59532, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Walter Joseph O'Donnell
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- 59532 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit Street, Boston, MA 02114
- Phone
- (617) 726-9112
- Enumerated
- Jan 13, 2006
- Record last updated
- May 5, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (617) 643-2874
- Medicaid ID
- 3080650 MA
- Medicare enrollment
- Enrolled (PECOS I20050506000423); accepts Medicare assignment
- Medical or professional school
- Js Weill Medical College, Cornell University, 1986
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 157 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephen Abraham, M.D.Specialist1487743316
- Nadia Ahmad, M.D.Internal Medicine Physician1912198037
- Fayaz Ahmed, MDStudent in an Organized Health Care Education/Training Program1528245024
- John Albin, MD, PHDInfectious Disease Physician1528472644
- Mary Amatangelo, NPAcute Care Nurse Practitioner1114191442
- Tian You An, M.D.Anesthesiology Physician1801145792
Verify Walter Joseph O'Donnell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 59532Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
472 Medicare Part D claims for 152 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D.
Most prescribed
- Breztri Aerosphere45 claims
- Omeprazole42 claims
- Azithromycin39 claims
- Trelegy Ellipta39 claims
- Anoro Ellipta34 claims
- Doxycycline Monohydrate24 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 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter Joseph O'Donnell among 157 critical care medicine (internal medicine) physician records in Massachusetts
Walter Joseph O'Donnell, MD is one of 157 critical care medicine (internal medicine) physician records with a practice address in Massachusetts. 78% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 56% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1986 · median 2005 among the 116 with a school on file
- Record last updated2014 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in Massachusetts
There are 157 critical care medicine (internal medicine) physician records in Massachusetts.
All 157 in Massachusetts → Every provider in Boston → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Edward Bittner, MD PHDBoston, MA 021141215912456
- Richard Channick, M.D.Boston, MA 021141144255886
- Alexandra Cist, MDBoston, MA 021141659344091
- Ashwin Dharmadhikari, MDBoston, MA 021141710968664
- Katherine Dudley, M.D.Boston, MA 021141245497619
- Jean Elrick, MDBoston, MA 021141275524993
- Ming-Hui Fan, MDBoston, MA 021141063561694
- Fiona Gibbons, MDBoston, MA 021141720079288
Common questions
What is Walter Joseph O'Donnell, MD's NPI number?
Walter Joseph O'Donnell, MD's National Provider Identifier (NPI) is 1356320758, issued on Jan 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter Joseph O'Donnell, MD located?
The NPPES record lists a practice address at 55 Fruit Street, Boston, MA, 02114. Phone: (617) 726-9112. Providers update this record themselves, so call before visiting.
How can I verify Walter Joseph O'Donnell, MD's license?
NPPES lists Massachusetts license number 59532, 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 Walter Joseph O'Donnell, MD prescribe under Medicare Part D?
In 2024, Walter Joseph O'Donnell, MD had 472 Medicare Part D claims for 152 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.