NATHANIEL J FULLERTON (MD) – Internal Medicine Physician, NPI 1366417461
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,941 INTERNAL MEDICINE in WI
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Provider Addresses for NATHANIEL J FULLERTON (MD)
PO BOX 249
FORT ATKINSON, WI 535380249
Phone: (920) 568-5411
Fax: (920) 568-4004
Type: Mailing
Fort Atkinson Memorial Hospital, 611, Sherman Avenue East, Fort Atkinson, Jefferson County, Wisconsin, 53538, United States
FORT ATKINSON, WI 535381960
Phone: (920) 568-5411
Fax: (920) 568-4004
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-09-07
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040907000694 | I | Internal Medicine | WI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 195 | 112 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 146 | 137 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 52 | 40 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 43 | 43 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 31 | 31 | $0 |
Insurance plans in this area (ZIP 53538)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | MO | |
| Family Practice | WI | |
| Nurse Practitioner | WI | |
| Internal Medicine | WI | |
| Nurse Practitioner | TN | |
| Nurse Practitioner | MO | |
| Internal Medicine | TN | |
| Family Practice | SC | |
| Nurse Practitioner | WI | |
| Nurse Practitioner | WI |
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