NATHANIEL CONLEY CASSELL (M.D.) – Critical Care Medicine (Internal Medicine) Physician, NPI 1518302470
Critical Care Medicine (Internal Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,360 CRITICAL CARE (INTENSIVISTS) in TX
Provider Addresses for NATHANIEL CONLEY CASSELL (M.D.)
1111 MEDICAL PLAZA DR STE 250
THE WOODLANDS, TX 773803477
Phone: (281) 296-8788
Fax: (281) 465-4569
Type: Mailing
1125 Cypress Station Dr Ste E
Houston, TX 770903055
Phone: (281) 296-8788
Fax: (281) 465-4569
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $56.
Total Amount is formed as General ($56) + Research ($0) + Ownership ($0) = $56.
Last reported payment date: 2023-09-06 • Largest payer in this snapshot: BioXcel Therapeutics, Inc. ($37).
Total Amount
$56
General + Research + Ownership
Payments
3
Total payment records
General Amount
$56
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-09-06
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| BioXcel Therapeutics, Inc. | $37 |
| Chiesi USA, Inc. | $19 |
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: 2017-09-08
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 |
|---|---|---|---|---|
| I20170908000315 | I | Critical Care (Intensivists) | TX | 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 |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 261 | 58 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 257 | 37 | $0 |
| 99291 | Critical care, first 30-74 minutes | 114 | 40 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 21 | 20 | $0 |
Insurance plans in this area (ZIP 77380)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| N E P H R O L O G Y | TX | |
| Physician Assistant | TX | |
| Nephrology, Internal Medicine | TX | |
| E N D O C R I N O L O G Y | WV | |
| N E P H R O L O G Y | TX | |
| Nephrology, Internal Medicine | TX | |
| - | TX | |
| Physician Assistant | TX | |
| Nephrology, Internal Medicine | TX | |
| Nurse Practitioner | TX |
Reviews
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