Quick answers
- Where does John D. Mark see patients?
- Medicare's clinician data lists 1 practice location in Palo Alto, CA. Call before your visit to confirm the address.
- What is John D. Mark's specialty?
- Medicare lists Pediatric Medicine as the primary specialty.
- Does John D. Mark accept Medicare assignment?
- Yes. Medicare's clinician data says John D. Mark 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.
- What is the phone number for John D. Mark?
- (650) 498-7200, as listed in official Medicare / NPI Registry data.
- What is John D. Mark's NPI number?
- 1801810353. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where John D. Mark is enrolled with Medicare (CMS data updated 2026-10-02).
- 725 Welch RdPalo Alto, CA 94304 (650) 498‑7200
Group practices
Medicare enrollment lists John D. Mark as a member of this group (CMS data updated 2026-10-02).
- LPCH Medical Group Div of Lucile337 clinicians in the group
Specialties
- Pediatric Medicineprimary
Other pediatricians in Palo Alto
Clinicians with the same Medicare primary specialty in Palo Alto, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Medical College Of Kansas City |
| Graduation year | 1978 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1801810353 |
| 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
- 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