John Merfeld, M.D.
NPI 1578550281 · Family Medicine Physician · La Crosse, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Merfeld, M.D. is a Family Medicine Physician provider in La Crosse, WI (NPI 1578550281).
Provider details
- NPI number
- 1578550281
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 38073 (WI)
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
403 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 | 137 | $115 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 82 | $92 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 56 | $16 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 54 | $79 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 32 | $63 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 131 | 32 |
| Amlodipine Besylate | 107 | 30 |
| Lisinopril | 100 | 24 |
| Omeprazole | 88 | 21 |
| Metoprolol Succinate | 68 | 17 |
| Gabapentin | 62 | — |
| Metformin Hcl |
Practice location
Mailing address
Additional practice locations (1)
- 800 West Ave SLa Crosse, WI 54601-8806Phone: (608) 784-6648Fax: (608) 791-9408
Registry dates
- Enumerated
- 2005-09-29
- Last updated
- 2021-11-11
- Certified
- 2021-11-11
Frequently asked questions
- What is John Merfeld's NPI number?
- John Merfeld's National Provider Identifier (NPI) is 1578550281, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Merfeld's specialty?
- John Merfeld is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Merfeld located?
- John Merfeld's practice location on file with NPPES is 815 10th St S, La Crosse, WI 54601-4764.
- What is John Merfeld's phone number?
- The practice phone number listed in the NPPES registry for John Merfeld is (608) 782-9760.
- Does John Merfeld accept Medicare?
- John Merfeld is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Merfeld's NPI active?
- Yes — John Merfeld's NPI (1578550281) is active in the NPPES registry as of the last update on 2021-11-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.