Mark Mounajjed, MD
NPI 1891789897 · Infectious Disease Physician · Madison, WI
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Mounajjed, MD is a Infectious Disease Physician provider in Madison, WI (NPI 1891789897).
Provider details
- NPI number
- 1891789897
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 45870 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
597 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 123 | $110 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 111 | $58 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 76 | $160 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 50 | $120 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 42 | $14 |
| Injection of Drug Or Substance Into Vein96374 | 39 | $34 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Penicillin V Potassium | 18 |
| Amoxicillin | 17 |
| Vancomycin Hcl | 17 |
| Ceftriaxone Sodiumbrand: Ceftriaxone | 16 |
| Ciprofloxacin Hcl | 14 |
| Cefadroxil | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 1506 S Oneida StAppleton, WI 54915-1305Phone: (920) 738-2000
- 1211 Fish Hatchery RdMadison, WI 53715-1909Phone: (608) 252-8000Fax: (608) 283-7318
Registry dates
- Enumerated
- 2005-09-06
- Last updated
- 2024-12-12
- Certified
- 2024-12-12
Frequently asked questions
- What is Mark Mounajjed's NPI number?
- Mark Mounajjed's National Provider Identifier (NPI) is 1891789897, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Mounajjed's specialty?
- Mark Mounajjed is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Mounajjed located?
- Mark Mounajjed's practice location on file with NPPES is 600 Highland Ave, Madison, WI 53792-0001.
- What is Mark Mounajjed's phone number?
- The practice phone number listed in the NPPES registry for Mark Mounajjed is (608) 263-0946.
- Does Mark Mounajjed accept Medicare?
- Mark Mounajjed is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Mounajjed's NPI active?
- Yes — Mark Mounajjed's NPI (1891789897) is active in the NPPES registry as of the last update on 2024-12-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.