NICKOLAS S DEMARK (DO) – Hospice and Palliative Medicine (Internal Medicine) Physician, NPI 1114214004
Hospice and Palliative Medicine (Internal Medicine) Physician
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Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,939 INTERNAL MEDICINE in WI
Provider Addresses for NICKOLAS S DEMARK (DO)
1726 Shawano Ave
Green Bay, WI 543033216
Phone: (920) 496-4700
Type: Location
130 2nd St
Neenah, WI 549562883
Phone: (920) 729-2738
Fax: (920) 729-3021
Type: Location
900 Illinois Ave
Stevens Point, WI 544813114
Phone: (715) 346-5000
Type: Location
1715 Dousman St
Green Bay, WI 543033211
Phone: (920) 496-4700
Type: Location
1818 N Meade St
Appleton, WI 549113454
Phone: (920) 735-7645
Fax: (920) 735-7618
Type: Location
122 E COLLEGE AVE
APPLETON, WI 549115794
Phone: (920) 996-3264
Fax: (920) 830-5970
Type: Mailing
130 2ND ST
NEENAH, WI 549562883
Phone: (920) 729-2738
Fax: (920) 729-3021
Type: Location
1229 C AVE E
OSKALOOSA, IA 525774298
Phone: (641) 672-3236
Type: Mailing
PO BOX 19070
GREEN BAY, WI 543079070
Phone: (920) 496-4700
Type: Mailing
1726 SHAWANO AVE
GREEN BAY, WI 543033216
Phone: (920) 496-4700
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: 2025-10-22
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 |
|---|---|---|---|---|
| I20251022002524 | I | Internal Medicine | IA | 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 | 183 | 61 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 30 | 30 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 27 | 27 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 26 | 26 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 16 | 16 | $0 |
Insurance plans in this area (ZIP 54303)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | IA | |
| - | IA | |
| Family Practice, Sports Medicine | IA | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| Family Practice | IA | |
| Nurse Practitioner | IA | |
| Family Practice, Obstetrics/Gynecology | IA | |
| Nurse Practitioner | IA | |
| Internal Medicine, Hospitalist | IN | |
| Family Practice | IA |
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