DR. WARREN LEWIS FIELDS (M.D.) – Internal Medicine Physician, NPI 1821083999
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,448 INTERNAL MEDICINE in CT
Provider Addresses for DR. WARREN LEWIS FIELDS (M.D.)
200 SANDY HOLLOW RD
MYSTIC, CT 063551720
Phone: (860) 572-8911
Fax: (860) 572-7758
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 6 Open Payments records for all available years, with a total value of $438.
Total Amount is formed as General ($438) + Research ($0) + Ownership ($0) = $438.
Last reported payment date: 2024-04-04 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($387).
Total Amount
$438
General + Research + Ownership
Payments
6
Total payment records
General Amount
$438
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-04-04
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GlaxoSmithKline, LLC. | $387 |
| Baxter Healthcare | $33 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $17 |
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: 2009-12-22
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 |
|---|---|---|---|---|
| I20091222000080 | I | Internal Medicine | CT | 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 | 610 | 264 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 389 | 219 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 208 | 119 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 149 | 149 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 90 | 90 | $0 |
Insurance plans in this area (ZIP 06355)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERNAL MEDICINE | CT | 81002 | Urinalysis, manual test | 195 | 190 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | CT | |
| - | CT | |
| - | MA | |
| - | CT | |
| Internal Medicine | IL | |
| - | CT | |
| - | CT | |
| Nurse Practitioner | CT | |
| - | CT | |
| Internal Medicine | CT |
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