MR. GREGORY D NADEN (MD) – Radiation Oncology Physician, NPI 1588649396
Radiation Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
69 RADIATION ONCOLOGY in IA
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Provider Addresses for MR. GREGORY D NADEN (MD)
June E. Nylen Cancer Center, 230, Nebraska Street, Sioux City, Woodbury County, Iowa, 51101, United States
SIOUX CITY, IA 511011733
Phone: (712) 252-9392
Fax: (712) 252-9404
Type: Location
639 HOSPITAL DR
MOUNTAIN HOME, AR 726532914
Phone: (479) 587-1700
Fax: (479) 587-1366
Type: Location
South Sioux City Post Office, West 23rd Street, South Sioux City, Dakota County, Nebraska, 68776, United States
SIOUX CITY, IA 511025017
Phone: (712) 252-9392
Fax: (712) 252-9404
Type: Mailing
3901 PARKWAY CIR
SPRINGDALE, AR 727626362
Phone: (479) 587-1700
Fax: (479) 587-1366
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 30 Open Payments records for all available years, with a total value of $467.
Total Amount is formed as General ($467) + Research ($0) + Ownership ($0) = $467.
Last reported payment date: 2024-12-02 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($72).
Total Amount
$467
General + Research + Ownership
Payments
30
Total payment records
General Amount
$467
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-02
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2022-08-15
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 |
|---|---|---|---|---|
| I20220815002276 | I | Radiation Oncology | AR | 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 |
|---|---|---|---|---|
| G6015 | Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session | 843 | 44 | $0 |
| 77014 | Ct guidance for insertion of radiation therapy fields | 730 | 46 | $0 |
| 77300 | Calculation of radiation therapy dose | 429 | 115 | $0 |
| 77427 | Radiation treatment management, 5 treatment sessions | 393 | 124 | $0 |
| 77336 | Continuing radiation therapy consultation per week | 217 | 65 | $0 |
Insurance plans in this area (ZIP 51101)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| RADIATION ONCOLOGY | IA | 74177 | CT scan of abdomen and pelvis with contrast | 99 | 80 |
| RADIATION ONCOLOGY | IA | 77263 | Management of radiation therapy, complex | 158 | 152 |
| RADIATION ONCOLOGY | IA | 77300 | Calculation of radiation therapy dose | 713 | 120 |
| RADIATION ONCOLOGY | IA | 77427 | Radiation treatment management, 5 treatments | 585 | 181 |
| RADIATION ONCOLOGY | IA | 78815 | Nuclear medicine study with CT imaging skull base to mid-thigh | 387 | 287 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | AR | |
| - | AR | |
| Nurse Practitioner | AR | |
| Medical Oncology, Hematology | AR | |
| Nurse Practitioner | AR | |
| Hospice/Palliative Care | AR | |
| Nurse Practitioner | AR | |
| Radiation Oncology | AR | |
| H E M A T O L O G Y/ O N C O L O G Y | AR | |
| Physician Assistant | AR |
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