John Ludlow, M.D.
NPI 1154615391 · Emergency Medicine Physician · Merced, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Ludlow, M.D. is a Emergency Medicine Physician provider in Merced, CA (NPI 1154615391).
Provider details
- NPI number
- 1154615391
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A122427 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-06-06
- Last updated
- 2021-12-22
Frequently asked questions
- What is John Ludlow's NPI number?
- John Ludlow's National Provider Identifier (NPI) is 1154615391, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Ludlow's specialty?
- John Ludlow is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Ludlow located?
- John Ludlow's practice location on file with NPPES is 333 Mercy Ave, Merced, CA 95340-8319.
- What is John Ludlow's phone number?
- The practice phone number listed in the NPPES registry for John Ludlow is (209) 564-5000.
- Does John Ludlow accept Medicare?
- John Ludlow is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Ludlow's NPI active?
- Yes — John Ludlow's NPI (1154615391) is active in the NPPES registry as of the last update on 2021-12-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.