Karen Fong, MD
NPI 1851396816 · Internal Medicine Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Fong, MD is a Internal Medicine Physician provider in San Luis Obispo, CA (NPI 1851396816).
Provider details
- NPI number
- 1851396816
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- G70251 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 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
826 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 363 | $133 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 161 | $15 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 124 | $94 |
| Administration of Pneumococcal VaccineG0009 | 71 | $33 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 37 | $186 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 101 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 215 | 49 |
| Ezetimibe | 201 | 52 |
| Atorvastatin Calcium | 195 | 48 |
| Amlodipine Besylate | 146 | 40 |
| Rosuvastatin Calcium | 111 | 28 |
| Omeprazole | 106 | 31 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$232 across 8 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
- 2005-06-16
- Last updated
- 2019-11-22
Frequently asked questions
- What is Karen Fong's NPI number?
- Karen Fong's National Provider Identifier (NPI) is 1851396816, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Fong's specialty?
- Karen Fong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Fong located?
- Karen Fong's practice location on file with NPPES is 184 Casa St, San Luis Obispo, CA 93405-1804.
- What is Karen Fong's phone number?
- The practice phone number listed in the NPPES registry for Karen Fong is (805) 242-4455.
- Does Karen Fong accept Medicare?
- Karen Fong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Fong's NPI active?
- Yes — Karen Fong's NPI (1851396816) is active in the NPPES registry as of the last update on 2019-11-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.