Quick answers
- Which hospitals does John J. Lah work at?
- Medicare's official clinician data lists John J. Lah at 2 hospitals: Memorialcare Long Beach Medical Center and UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. Lah see patients?
- Medicare's clinician data lists 1 practice location in Fallbrook, CA. Call before your visit to confirm the address.
- What is John J. Lah's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does John J. Lah accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Lah accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John J. Lah offer telehealth?
- Medicare's clinician data says John J. Lah offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John J. Lah?
- (760) 728-9560, as listed in official Medicare / NPI Registry data.
- What is John J. Lah's NPI number?
- 1437221272. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John J. Lah works
Medicare's Facility Affiliation Data lists John J. Lah at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorialcare Long Beach Medical CenterLong Beach, CA · Acute Care Hospital · CCN 050485
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where John J. Lah is enrolled with Medicare (CMS data updated 2026-10-02).
- 521 E Elder St, Suite 104Fallbrook, CA 92028 (760) 728‑9560
Group practices
Medicare enrollment lists John J. Lah as a member of this group (CMS data updated 2026-10-02).
- United Medical Doctors173 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1437221272 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians