Quick answers
- Does Margaret L. Grossman accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret L. Grossman 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 Margaret L. Grossman see?
- In 2024, CMS data shows 243 Original Medicare patients and 1,569 services for Margaret L. Grossman. This counts Original Medicare only and measures volume, not quality.
- What is Margaret L. Grossman's NPI number?
- 1942352075. 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 Margaret L. Grossman, 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 | 243 |
|---|---|
| Services billed to Medicare | 1,569 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)443 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)264 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)209 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)121 services
- Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg (J3420)116 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 cholesterol73%
- High blood pressure57%
- Arthritis30%
- Osteoporosis24%
- Chronic kidney disease17%
- Depression16%
Hospitals where Margaret L. Grossman works
Medicare's Facility Affiliation Data lists Margaret L. Grossman 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.
- Mad River Community HospitalArcata, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050028
- Providence St Joseph HospitalEureka, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050006
Practice locations
Addresses where Margaret L. Grossman is enrolled with Medicare (CMS data updated October 2, 2026).
- 1600 Weeot WayArcata, CA 95521 (707) 825‑5000
- 4715 Valley E BlvdArcata, CA 95521 (707) 825‑3700
Group practices
Medicare enrollment lists Margaret L. Grossman as a member of this group (CMS data updated October 2, 2026).
- United Indian Health Services, Inc.24 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Arcata
Clinicians with the same Medicare primary specialty in Arcata, CA — not a recommendation.
Other clinicians in United Indian Health Services, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 1984 (42 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942352075 |
| 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