Katherine Hartstern, MD
NPI 1437773652 · Family Medicine Physician · Oshkosh, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Hartstern, MD is a Family Medicine Physician provider in Oshkosh, WI (NPI 1437773652).
Provider details
- NPI number
- 1437773652
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 125076039 (IL)
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
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
207 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 78 | $121 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 45 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 39 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 18 | $85 |
| Administration of Influenza Virus VaccineG0008 | 16 | $10 |
| Administration of Pneumococcal VaccineG0009 | 11 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 127 | 46 |
| Losartan Potassium | 95 | 29 |
| Levothyroxine Sodium | 92 | 33 |
| Omeprazole | 71 | 30 |
| Pantoprazole Sodium | 70 | 14 |
| Lisinopril | 70 | 31 |
| Lovastatin | 69 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$13 across 1 record (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
Registry dates
- Enumerated
- 2020-06-03
- Last updated
- 2025-03-19
- Certified
- 2025-03-19
Frequently asked questions
- What is Katherine Hartstern's NPI number?
- Katherine Hartstern's National Provider Identifier (NPI) is 1437773652, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Hartstern's specialty?
- Katherine Hartstern is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Hartstern located?
- Katherine Hartstern's practice location on file with NPPES is 1855 S Koeller St, Oshkosh, WI 54902-6186.
- What is Katherine Hartstern's phone number?
- The practice phone number listed in the NPPES registry for Katherine Hartstern is (920) 738-2000.
- Does Katherine Hartstern accept Medicare?
- Katherine Hartstern is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Hartstern's NPI active?
- Yes — Katherine Hartstern's NPI (1437773652) is active in the NPPES registry as of the last update on 2025-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.