Quick answers
- Does Mehrdad M. Massumi accept Medicare assignment?
- Yes. Medicare's clinician data says Mehrdad M. Massumi 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 Mehrdad M. Massumi see?
- In 2024, CMS data shows 179 Original Medicare patients and 36,026 services for Mehrdad M. Massumi. This counts Original Medicare only and measures volume, not quality.
- What is Mehrdad M. Massumi's NPI number?
- 1407894975. 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 Mehrdad M. Massumi, 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 | 179 |
|---|---|
| Services billed to Medicare | 36,026 |
| Different services or procedures | 42 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Injection, methylprednisolone acetate, 1 mg (J1010)22,590 services
- Hyaluronan or derivative, synvisc or synvisc-one, for intra-articular injection, 1 mg (J7325)2,832 services
- Injection of anesthetic agent and/or steroid into other nerve or branch (64450)1,602 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,187 services
- Injection into tendon or ligament (20550)1,054 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 cholesterol75%
- Arthritis75%
- High blood pressure68%
- Diabetes40%
- Ischemic heart disease37%
- Depression31%
Practice locations
Addresses where Mehrdad M. Massumi is enrolled with Medicare (CMS data updated October 2, 2026).
- 15201 Shady Grove Rd, Suite 102Rockville, MD 20850
- 660 Kenilworth Dr, Suite 200Towson, MD 21204 (410) 825‑5905
Specialties
Find other Physical Medicine and Rehabilitation doctors in Maryland →
Other rehabilitation doctors in Rockville
Clinicians with the same Medicare primary specialty in Rockville, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1982 (44 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) | 1407894975 |
| 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
- 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