Mark Welnick, M.D.
NPI 1255698221 · Diagnostic Radiology Physician · Green Bay, WI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Welnick, M.D. is a Diagnostic Radiology Physician provider in Green Bay, WI (NPI 1255698221).
Provider details
- NPI number
- 1255698221
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 63777 (MN)
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 tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
706 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 104 | $35 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 93 | $19 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 88 | $11 |
| Ultrasonic Guidance for Blood Vessel Access76937 | 53 | $13 |
| Mri Scan of Lower Spinal Canal Without Contrast72148 | 40 | $119 |
| Ultrasound Scan of Abdominal Aorta76706 | 33 | $24 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clopidogrel Bisulfatebrand: Clopidogrel | 43 | 17 |
| Cilostazol | 21 | — |
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$8,397 across 30 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (5)
- 610 S Lincoln RdEscanaba, MI 49829-1215Phone: (906) 786-6488Fax: (906) 786-6409
- 440 Woodward AveIron Mountain, MI 49801-4631Phone: (906) 776-9040Fax: (906) 774-7279
- 2845 Greenbrier RdGreen Bay, WI 54311-6519Phone: (920) 288-4848Fax: (920) 288-4956
- 2820 Roosevelt RdMarinette, WI 54143-3834Phone: (715) 735-5225Fax: (715) 735-5388
- 820 Arbutus AveOconto, WI 54153-2004Phone: (920) 835-1100Fax: (920) 835-1099
Registry dates
- Enumerated
- 2012-04-16
- Last updated
- 2025-08-28
- Certified
- 2025-08-28
Frequently asked questions
- What is Mark Welnick's NPI number?
- Mark Welnick's National Provider Identifier (NPI) is 1255698221, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Welnick's specialty?
- Mark Welnick is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Welnick located?
- Mark Welnick's practice location on file with NPPES is 744 S Webster Ave, Green Bay, WI 54301-3505.
- What is Mark Welnick's phone number?
- The practice phone number listed in the NPPES registry for Mark Welnick is (920) 433-6084.
- Does Mark Welnick accept Medicare?
- Mark Welnick is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Welnick's NPI active?
- Yes — Mark Welnick's NPI (1255698221) is active in the NPPES registry as of the last update on 2025-08-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.