WILLIAM V III HARRER (M.D.) – Hematology & Oncology Physician, NPI 1972584217
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,007 HEMATOLOGY/ONCOLOGY in FL
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Provider Addresses for WILLIAM V III HARRER (M.D.)
770, Southeast 5th Terrace, Crystal River, Citrus County, Florida, 34429, United States
CRYSTAL RIVER, FL 344294852
Phone: (352) 795-6674
Fax: (352) 795-2017
Type: Mailing
PO BOX 850
PORT ANGELES, WA 983620146
Phone: (360) 417-7111
Fax: (360) 582-5614
Type: Mailing
PO BOX 102222
ATLANTA, GA 303682222
Phone: (352) 860-7450
Fax: (352) 860-7450
Type: Mailing
2231 HIGHWAY 44 W
INVERNESS, FL 344533879
Phone: (352) 860-7400
Fax: (352) 860-7450
Type: Location
844 N 5TH AVE
SEQUIM, WA 983823045
Phone: (360) 839-8953
Fax: (605) 825-6143
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 134 Open Payments records for all available years, with a total value of $3,151.
Total Amount is formed as General ($3,151) + Research ($0) + Ownership ($0) = $3,151.
Last reported payment date: 2024-08-01 • Largest payer in this snapshot: Incyte Corporation ($262).
Total Amount
$3,151
General + Research + Ownership
Payments
134
Total payment records
General Amount
$3,151
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-01
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Incyte Corporation | $262 |
| E.R. Squibb & Sons, L.L.C. | $184 |
| Astellas Pharma US Inc | $170 |
| Kite Pharma, Inc. | $164 |
| BeiGene USA, Inc. | $162 |
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: 2024-01-02
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20101115000609 | I | Hematology/Oncology | FL | TBD |
| I20240102003161 | I | Hematology/Oncology | CO | 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 |
|---|---|---|---|---|
| Q0138 | Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) | 70,890 | 69 | $0 |
| J0885 | Injection, epoetin alfa, (for non-esrd use), 1000 units | 8,350 | 32 | $0 |
| J0897 | Injection, denosumab, 1 mg | 7,740 | 70 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 1,615 | 518 | $0 |
| 85025 | Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 1,552 | 472 | $0 |
Insurance plans in this area (ZIP 34429)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | CO | |
| General Surgery | CO | |
| Clinical Social Worker | CO | |
| Physician Assistant | CO | |
| Sports Medicine, Family Practice | OK | |
| Nurse Practitioner | CO | |
| Certified Registered Nurse Anesthetist (Crna) | CO | |
| Certified Registered Nurse Anesthetist (Crna) | FL | |
| Nurse Practitioner | CO | |
| Nurse Practitioner | CO |
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