Karen Simon, M.D.
NPI 1548384167 · Gastroenterology Physician · Oxnard, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Simon, M.D. is a Gastroenterology Physician provider in Oxnard, CA (NPI 1548384167).
Provider details
- NPI number
- 1548384167
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A81831 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
3,591 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) |
|---|---|---|
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99439 | 1,172 | $51 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 644 | $66 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 367 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 220 | $97 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 171 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 95 | 33 |
| Omeprazole | 83 | 35 |
| Mesalamine | 39 | — |
| Dicyclomine Hcl | 38 | 13 |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine | 36 | — |
| Sucralfate | 34 | 15 |
| Famotidine | 33 | 19 |
| Linaclotide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,144 across 92 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
- 2007-03-19
- Last updated
- 2015-12-09
Frequently asked questions
- What is Karen Simon's NPI number?
- Karen Simon's National Provider Identifier (NPI) is 1548384167, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Simon's specialty?
- Karen Simon is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Simon located?
- Karen Simon's practice location on file with NPPES is 2241 Wankel Way, Oxnard, CA 93030.
- What is Karen Simon's phone number?
- The practice phone number listed in the NPPES registry for Karen Simon is (805) 983-0521.
- Does Karen Simon accept Medicare?
- Karen Simon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Simon's NPI active?
- Yes — Karen Simon's NPI (1548384167) is active in the NPPES registry as of the last update on 2015-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.