Mark Hauptman, M.D.
NPI 1801873427 · Internal Medicine Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hauptman, M.D. is a Internal Medicine Physician provider in Mission Viejo, CA (NPI 1801873427).
Provider details
- NPI number
- 1801873427
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G55356 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
52 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 38 | $138 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 14 | $140 |
Typical Medicare-allowed amounts for these services range $138–$140 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 51 | 14 |
| Ramipril | 46 | 14 |
| Amlodipine Besylate | 28 | — |
| Alendronate Sodium | 27 | — |
| Losartan Potassium | 25 | — |
| Tamsulosin Hcl | 22 | — |
| Rosuvastatin Calcium | 19 | — |
Practice location
Mailing address
Additional practice locations (1)
- 26800 Crown Valley PkwySuite 305Mission Viejo, CA 92691-6384Phone: (949) 364-6000Fax: (949) 364-3213
Registry dates
- Enumerated
- 2005-12-23
- Last updated
- 2025-09-04
- Certified
- 2025-09-04
Frequently asked questions
- What is Mark Hauptman's NPI number?
- Mark Hauptman's National Provider Identifier (NPI) is 1801873427, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hauptman's specialty?
- Mark Hauptman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Hauptman located?
- Mark Hauptman's practice location on file with NPPES is 26991 Crown Valley Pkwy Ste 100, Mission Viejo, CA 92691-6511.
- What is Mark Hauptman's phone number?
- The practice phone number listed in the NPPES registry for Mark Hauptman is (949) 582-5430.
- Does Mark Hauptman accept Medicare?
- Mark Hauptman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hauptman's NPI active?
- Yes — Mark Hauptman's NPI (1801873427) is active in the NPPES registry as of the last update on 2025-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.