REX L MAHNENSMITH (M.D.) – Internal Medicine Physician, NPI 1760466528
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,448 INTERNAL MEDICINE in CT
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Provider Addresses for REX L MAHNENSMITH (M.D.)
80, Phoenix Avenue, Exchange Place, Waterbury, New Haven County, Connecticut, 06702, United States
WATERBURY, CT 067021418
Phone: (203) 756-8021
Fax: (203) 596-9038
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 36 Open Payments records for all available years, with a total value of $673.
Total Amount is formed as General ($673) + Research ($0) + Ownership ($0) = $673.
Last reported payment date: 2024-11-14 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($336).
Total Amount
$673
General + Research + Ownership
Payments
36
Total payment records
General Amount
$673
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-14
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: 2010-08-30
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 |
|---|---|---|---|---|
| I20100830000814 | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 294 | 239 | $0 |
| 0241U | Respiratory infectious agent detection by rna for severe acute respiratory syndrome coronavirus 2 (covid 19), influenza a, influenza b, and respiratory syncytial virus, upper respiratory specimen, each reported as detected or not detected | 122 | 114 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 117 | 117 | $0 |
| 87428 | Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza | 101 | 101 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 70 | 68 | $0 |
Insurance plans in this area (ZIP 06702)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| Physician Assistant | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| Physician Assistant | CT |
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