Kar Own, MD
NPI 1558449454 · Nephrology Physician · Vallejo, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kar Own, MD is a Nephrology Physician provider in Vallejo, CA (NPI 1558449454).
Provider details
- NPI number
- 1558449454
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A53485 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
87 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 76 | $84 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 11 | $138 |
Typical Medicare-allowed amounts for these services range $84–$138 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Calcitriol | 82 | 28 |
| Losartan Potassium | 62 | 25 |
| Sevelamer Carbonate | 55 | 22 |
| Amlodipine Besylate | 54 | 27 |
| Calcium Acetate | 47 | 19 |
| Empagliflozinbrand: Jardiance | 29 | 14 |
| Furosemide | 28 | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-17
Frequently asked questions
- What is Kar Own's NPI number?
- Kar Own's National Provider Identifier (NPI) is 1558449454, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kar Own's specialty?
- Kar Own is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Kar Own located?
- Kar Own's practice location on file with NPPES is 975 Sereno Dr, Vallejo, CA 94589-2441.
- What is Kar Own's phone number?
- The practice phone number listed in the NPPES registry for Kar Own is (707) 651-1000.
- Does Kar Own accept Medicare?
- Kar Own is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kar Own's NPI active?
- Yes — Kar Own's NPI (1558449454) is active in the NPPES registry as of the last update on 2021-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.