Hanno P. Muellner, MD
Internal Medicine Physician · Williamsburg, MA
Hanno P. Muellner, MD is an internal medicine physician with a practice address in Williamsburg, Massachusetts, and NPI 1548220684, issued on Mar 24, 2006. Check the license (Massachusetts 155543, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Hanno P. Muellner
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 155543 MA
Self-reported in NPPES; status is on the state search - Practice location
- 14 Williams St, Williamsburg, MA 01096
- Phone
- (413) 268-3616
- Enumerated
- Mar 24, 2006
- Record last updated
- Oct 25, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (413) 268-0337
- Medicaid ID
- 3173887 MA
- Medicare enrollment
- Enrolled (PECOS I20050127000271); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 14 Williams St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Fletcher, NPAdult Health Nurse Practitioner1255575791
- Joanna Pheasant, ARNPAdult Health Nurse Practitioner1427470996
- Peter Siersma, MDInternal Medicine Physician1730148149
Verify Hanno P. Muellner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 155543Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average internal medicine physician in 2024
10,453 Medicare Part D claims for 853 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 856 claims were for opioids.
Most prescribed
- Oxycodone Hcl467 claims
- Atorvastatin Calcium403 claims
- Levothyroxine Sodium393 claims
- Lisinopril319 claims
- Gabapentin258 claims
- Amlodipine Besylate219 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
- Mass General Brigham Medical Group Western Massachusetts IncNorthampton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hanno P. Muellner among 6,825 internal medicine physician records in Massachusetts
Hanno P. Muellner, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1994 · median 2004 among the 4,103 with a school on file
- Record last updated2011 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Williamsburg
They are 3 of the 22 NPPES records with a practice address in Williamsburg, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Williamsburg → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Christopher Flory, M.D.Williamsburg, MA 010961932148467
- Peter Siersma, MDWilliamsburg, MA 010961730148149
- Brian Banker, MDWilbraham, MA 010951871711192
- Subha Clarke, MDWilbraham, MA 010951477572436
- Sarah Freedman, M.D.Wilbraham, MA 010951396918447
- Spencer Haller, M.D.Wilbraham, MA 010951679787535
- Philip Halon, M.D.Wilbraham, MA 010951942336532
- Navatha Hanumagutti, M.D.Wilbraham, MA 010951710299664
Common questions
What is Hanno P. Muellner, MD's NPI number?
Hanno P. Muellner, MD's National Provider Identifier (NPI) is 1548220684, issued on Mar 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Hanno P. Muellner, MD located?
The NPPES record lists a practice address at 14 Williams St, Williamsburg, MA, 01096. Phone: (413) 268-3616. Providers update this record themselves, so call before visiting.
How can I verify Hanno P. Muellner, MD's license?
NPPES lists Massachusetts license number 155543, 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 Hanno P. Muellner, MD prescribe under Medicare Part D?
In 2024, Hanno P. Muellner, MD had 10,453 Medicare Part D claims for 853 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.