Quick answers
- Does Karen Kovalow-Stjohn accept Medicare assignment?
- Yes. Medicare's clinician data says Karen Kovalow-Stjohn 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 Karen Kovalow-Stjohn see?
- In 2024, CMS data shows 536 Original Medicare patients and 140,600 services for Karen Kovalow-Stjohn. This counts Original Medicare only and measures volume, not quality.
- What is Karen Kovalow-Stjohn's NPI number?
- 1336146281. 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 Karen Kovalow-Stjohn, 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 | 536 |
|---|---|
| Services billed to Medicare | 140,600 |
| Different services or procedures | 36 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, tocilizumab, 1 mg (J3262)52,120 services
- Injection, golimumab, 1 mg, for intravenous use (J1602)17,900 services
- Injection, romosozumab-aqqg, 1 mg (J3111)12,600 services
- Injection, denosumab, 1 mg (J0897)7,980 services
- Injection, rituximab, 10 mg (J9312)5,300 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).
- Arthritis75%
- High cholesterol73%
- High blood pressure60%
- Osteoporosis60%
- Anxiety24%
- Depression23%
Hospitals where Karen Kovalow-Stjohn works
Medicare's Facility Affiliation Data lists Karen Kovalow-Stjohn 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.
- Adventist Health Sierra VistaSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050506
- Adventist Health Twin CitiesTempleton, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050633
- French Hospital Medical CenterSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050232
- Marian Regional Medical CenterSanta Maria, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050107
Practice locations
Addresses where Karen Kovalow-Stjohn is enrolled with Medicare (CMS data updated October 2, 2026).
- 77 Casa St, Suite 101San Luis Obispo, CA 93405
Group practices
Medicare enrollment lists Karen Kovalow-Stjohn as a member of this group (CMS data updated October 2, 2026).
- Rheumatology Services Medical Group8 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in San Luis Obispo
Clinicians with the same Medicare primary specialty in San Luis Obispo, CA — not a recommendation.
Other clinicians in Rheumatology Services Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 1983 (43 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) | 1336146281 |
| 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