DR. NATHAN MICHAEL MARKWART (D.O.) – Critical Care Medicine (Internal Medicine) Physician, NPI 1265774574
Critical Care Medicine (Internal Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,454 CRITICAL CARE (INTENSIVISTS) in FL
Provider Addresses for DR. NATHAN MICHAEL MARKWART (D.O.)
9420 POINCIANA PL
APT 403
DAVIE, FL 333244848
Phone: (716) 560-3616
Type: Mailing
1601 CLINT MOORE RD
SUITE 100
BOCA RATON, FL 334872768
Phone: (561) 939-0200
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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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: 2015-07-20
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 |
|---|---|---|---|---|
| I20150720002808 | I | Critical Care (Intensivists) | FL | 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 |
|---|---|---|---|---|
| 99291 | Critical care, first 30-74 minutes | 568 | 292 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 153 | 121 | $0 |
| 36620 | Insertion of artery tube for blood sampling or infusion through skin | 20 | 20 | $0 |
| 31500 | Emergent insertion of breathing tube into windpipe using an endoscope | 16 | 15 | $0 |
| 36556 | Insertion of non-tunneled central venous tube for infusion (5 years or older) | 16 | 16 | $0 |
Insurance plans in this area (ZIP 33324)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| CRITICAL CARE (INTENSIVISTS) | FL | 31500 | Emergent insertion of breathing tube into windpipe cartilage using an endoscope | 52 | 51 |
| CRITICAL CARE (INTENSIVISTS) | FL | 36620 | Insertion of arterial catheter for blood sampling or infusion, accessed through the skin | 56 | 52 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Critical Care (Intensivists), Pulmonary Disease | FL | |
| Pulmonary Disease, Critical Care (Intensivists) | FL | |
| Pulmonary Disease, Critical Care (Intensivists) | FL | |
| Pulmonary Disease, Critical Care (Intensivists), Internal Medicine | FL | |
| Internal Medicine, Critical Care (Intensivists), Pulmonary Disease | FL | |
| Critical Care (Intensivists) | AR | |
| Pulmonary Disease, Critical Care (Intensivists) | FL | |
| Pulmonary Disease, Critical Care (Intensivists) | NY | |
| Nurse Practitioner | FL | |
| Critical Care (Intensivists) | NJ |
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