Mark Zacharjasz, M.D.
NPI 1346621059 · Family Medicine Physician · Oskaloosa, IA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Zacharjasz, M.D. is a Family Medicine Physician provider in Oskaloosa, IA (NPI 1346621059).
Provider details
- NPI number
- 1346621059
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2015019270 (MO)
Specialties & taxonomies
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
11 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
535 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) |
|---|---|---|
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 208 | $60 |
| Remote Monitoring of Physiologic Parameters, Initial Supply of Devices With Daily Recordings Or Programmed Alerts Transmission, Each 30 Days99454 | 139 | $44 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 122 | $47 |
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99439 | 31 | $44 |
| Remote Monitoring of Physiologic Parameters, Initial Set-Up and Patient Education on Use of Equipment99453 | 19 | $18 |
| Online Digital Evaluation and Management Service for an Established Patient for Up to 7 Days, Total Time 11-20 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 208 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 724 | 194 |
| Atorvastatin Calcium | 685 | 173 |
| Levothyroxine Sodium | 582 | 132 |
| Amlodipine Besylate | 494 | 121 |
| Lisinopril | 377 | 95 |
| Furosemide | 363 | 90 |
| Hydrocodone/Acetaminophen |
Practice location
Mailing address
Additional practice locations (2)
- 615 S New Ballas RdFamily MedicineSaint Louis, MO 63141-8221Phone: (314) 251-8888Fax: (314) 251-8889
- 615 S New Ballas RdFamily MedicineSaint Louis, MO 63141-8221Phone: (314) 251-8888Fax: (314) 251-8889
Registry dates
- Enumerated
- 2015-06-18
- Last updated
- 2018-12-28
Frequently asked questions
- What is Mark Zacharjasz's NPI number?
- Mark Zacharjasz's National Provider Identifier (NPI) is 1346621059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Zacharjasz's specialty?
- Mark Zacharjasz is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Zacharjasz located?
- Mark Zacharjasz's practice location on file with NPPES is 1229 C Ave E, Oskaloosa, IA 52577.
- What is Mark Zacharjasz's phone number?
- The practice phone number listed in the NPPES registry for Mark Zacharjasz is (641) 672-3100.
- Does Mark Zacharjasz accept Medicare?
- Mark Zacharjasz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Zacharjasz's NPI active?
- Yes — Mark Zacharjasz's NPI (1346621059) is active in the NPPES registry as of the last update on 2018-12-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.