Karen Kovalow-St. John, M.D.
NPI 1336146281 · Rheumatology Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Kovalow-St. John, M.D. is a Rheumatology Physician provider in San Luis Obispo, CA (NPI 1336146281).
Provider details
- NPI number
- 1336146281
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 01037613A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,738 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 498 | $144 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 470 | $127 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 320 | $15 |
| Administration of Chemotherapy Into Vein, Each Additional Hour96415 | 219 | $30 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 95 | $174 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 80 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 279 | 65 |
| Prednisone | 218 | 52 |
| Celecoxib | 127 | 28 |
| Alendronate Sodium | 123 | 34 |
| Meloxicam | 120 | 30 |
| Methotrexate Sodiumbrand: Methotrexate | 106 | 20 |
| Allopurinol | 50 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,398 across 165 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-07
- Last updated
- 2021-09-14
- Certified
- 2021-03-07
Frequently asked questions
- What is Karen Kovalow-St. John's NPI number?
- Karen Kovalow-St. John's National Provider Identifier (NPI) is 1336146281, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Kovalow-St. John's specialty?
- Karen Kovalow-St. John is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Kovalow-St. John located?
- Karen Kovalow-St. John's practice location on file with NPPES is 77 Casa St Ste 101, San Luis Obispo, CA 93405-5804.
- What is Karen Kovalow-St. John's phone number?
- The practice phone number listed in the NPPES registry for Karen Kovalow-St. John is (661) 695-8385.
- Does Karen Kovalow-St. John accept Medicare?
- Karen Kovalow-St. John is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Kovalow-St. John's NPI active?
- Yes — Karen Kovalow-St. John's NPI (1336146281) is active in the NPPES registry as of the last update on 2021-09-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.