Marc Oh, FNP-C, RN
NPI 1235847625 · Family Nurse Practitioner · Castaic, CA
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Oh, FNP-C, RN is a Family Nurse Practitioner provider in Castaic, CA (NPI 1235847625).
Provider details
- NPI number
- 1235847625
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C, RN
- Sex
- Male
- Sole proprietor
- Yes
- License
- 95208278 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 64 | 22 |
| Metformin Hcl | 49 | 22 |
| Atorvastatin Calcium | 46 | 23 |
| Sitagliptin Phosphatebrand: Januvia | 36 | — |
| Empagliflozinbrand: Jardiance | 28 | — |
| Lisinopril | 21 | — |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$156 across 6 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
- 2022-11-14
- Last updated
- 2023-05-08
- Certified
- 2023-05-08
Frequently asked questions
- What is Marc Oh's NPI number?
- Marc Oh's National Provider Identifier (NPI) is 1235847625, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Oh's specialty?
- Marc Oh is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marc Oh located?
- Marc Oh's practice location on file with NPPES is 31541 Rocca Dr, Castaic, CA 91384-2598.
- What is Marc Oh's phone number?
- The practice phone number listed in the NPPES registry for Marc Oh is (661) 207-1326.
- Does Marc Oh accept Medicare?
- Marc Oh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Oh's NPI active?
- Yes — Marc Oh's NPI (1235847625) is active in the NPPES registry as of the last update on 2023-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.