Quick answers
- Does Hanno P. Muellner accept Medicare assignment?
- Yes. Medicare's clinician data says Hanno P. Muellner accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Hanno P. Muellner see?
- In 2024, CMS data shows 549 Original Medicare patients and 2,524 services for Hanno P. Muellner. This counts Original Medicare only and measures volume, not quality.
- What is Hanno P. Muellner's NPI number?
- 1548220684. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Hanno P. Muellner, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 549 |
|---|---|
| Services billed to Medicare | 2,524 |
| Different services or procedures | 51 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, methylprednisolone acetate, 1 mg (J1010)1,049 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)448 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)297 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)217 services
- Telephone medical discussion with physician, 21-30 minutes (99443)125 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure55%
- High cholesterol54%
- Arthritis38%
- Anxiety26%
- Depression20%
- Ischemic heart disease18%
Hospitals where Hanno P. Muellner works
Medicare's Facility Affiliation Data lists Hanno P. Muellner at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Baystate Franklin Medical CenterGreenfield, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220016
- Berkshire Medical CenterPittsfield, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220046
- The Cooley Dickinson Hospital IncNorthampton, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220015
Practice locations
Addresses where Hanno P. Muellner is enrolled with Medicare (CMS data updated October 2, 2026).
- 10 Denniston Pl, Womens HealthNorthampton, MA 01060 (413) 586‑9866
- 14 Williams St, Williamsburg Internal MedicineWilliamsburg, MA 01096 (413) 268‑3616
- 30 Locust StNorthampton, MA 01060
Group practices
Medicare enrollment lists Hanno P. Muellner as a member of this group (CMS data updated October 2, 2026).
- Mass General Brigham Medical Group Western Massachusetts Inc291 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Northampton
Clinicians with the same Medicare primary specialty in Northampton, MA — not a recommendation.
Other clinicians in Mass General Brigham Medical Group Western Massachusetts Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Massachusetts Medical School |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548220684 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians