Quick answers
- Where does Mark D. Hauptman see patients?
- Medicare's clinician data lists 1 practice location in Mission Viejo, CA. Call before your visit to confirm the address.
- What is Mark D. Hauptman's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Mark D. Hauptman accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Hauptman 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 Mark D. Hauptman?
- (949) 582-5430, as listed in official Medicare / NPI Registry data.
- What is Mark D. Hauptman's NPI number?
- 1801873427. 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 Mark D. Hauptman is enrolled with Medicare (CMS data updated 2026-10-02).
- 26991 Crown Valley Pkwy, Suite 100Mission Viejo, CA 92691 (949) 582‑5430
Group practices
Medicare enrollment lists Mark D. Hauptman as a member of this group (CMS data updated 2026-10-02).
- Healthcare Partners Affiliates Medical Group754 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Mission Viejo
Clinicians with the same Medicare primary specialty in Mission Viejo, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Irvine, California College Of Medicine |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1801873427 |
| 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