Dr. Nathaniel P Fleischner , MD
Internal Medicine • Royal Palm Beach, FL
11700 Okeechobee Blvd
Royal Palm Beach, FL 334118721
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Nathaniel Fleischner is listed in NPPES under Internal Medicine.
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NPI assigned on April 30, 2008; this date does not establish years in practice.
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Published CMS data list 319 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99213 — Established patient outpatient office visit: 129 service units.
- 99214 — Established patient outpatient office visit: 58 service units.
- 36415 — Insertion of needle into vein for collection of blood sample: 39 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 7,654 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium — 416 prescription fills, including refills.
- Amlodipine Besylate — 327 prescription fills, including refills.
- Losartan Potassium — 279 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 147 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 70% of clinicians listed under Internal Medicine in Florida (2024, 5,821 clinicians with data). Median for this group: 689. Middle half: 278 to 1,488.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 906 in 2020 to 319 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
11700 Okeechobee Blvd
Royal Palm Beach, FL 334118721
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Accountable Teaching Services Llc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Boston University School Of Medicine
2005
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
76 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $25,673 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $21,009 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
16,255 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$503,403 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $183.58 across 9 records.
By nature of payment
- Food and Beverage: $183.58 across 9 records.
Reporting-company totals (3 largest of 6)
- Novo Nordisk Inc: $48.62 across 3 records.
- Eli Lilly and Company: $46.92 across 2 records.
- Exact Sciences Corporation: $28.31 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
21 years (graduated 2005)
CMS Doctors and Clinicians data list 2005 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Fleischner has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Fleischner as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Royal Palm Beach and Florida
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 70% of clinicians listed under Internal Medicine in Florida (2024, 5,821 clinicians with data). Median for this group: 689. Middle half: 278 to 1,488.
Too few clinicians listed under Internal Medicine in Royal Palm Beach have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 75% of clinicians listed under Internal Medicine in Florida (2024, 5,821 clinicians with data). Median for this group: $68,400. Middle half: $27,804 to $138,071.
Too few clinicians listed under Internal Medicine in Royal Palm Beach have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 70% of clinicians listed under Internal Medicine in Florida (2024, 5,821 clinicians with data). Median for this group: $52,790. Middle half: $20,913 to $107,263.
Too few clinicians listed under Internal Medicine in Royal Palm Beach have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Internal Medicine in Florida (2024, 6,598 clinicians with data). Median for this group: 1,264. Middle half: 150 to 5,826.
Too few clinicians listed under Internal Medicine in Royal Palm Beach have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 75% of clinicians listed under Internal Medicine in Florida (2024, 6,598 clinicians with data). Median for this group: $82,811. Middle half: $7,744 to $429,824.
Too few clinicians listed under Internal Medicine in Royal Palm Beach have Medicare Part D data for 2024 to compare.
7 active clinicians are listed under Internal Medicine with a practice address in Royal Palm Beach, FL (10,334 in Florida).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 65% from 906 in 2020 to 319 in 2024.
- 2020: 906
- 2021: 960
- 2022: 1,052
- 2023: 478
- 2024: 319
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Medicare-allowed amount
Medicare-allowed amount decreased 71% from $89,001 in 2020 to $25,673 in 2024.
- 2020: $89,001
- 2021: $85,556
- 2022: $98,275
- 2023: $42,558
- 2024: $25,673
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Paid by Medicare
Paid by Medicare decreased 70% from $70,783 in 2020 to $21,009 in 2024.
- 2020: $70,783
- 2021: $67,024
- 2022: $75,361
- 2023: $33,359
- 2024: $21,009
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 4060% from 184 in 2020 to 7,654 in 2024.
- 2020: 184
- 2021: 101
- 2022: 294
- 2023: 2,769
- 2024: 7,654
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30-day fills
30-day fills increased 8185% from 196 in 2020 to 16,255 in 2024.
- 2020: 196
- 2021: 104
- 2022: 303
- 2023: 4,548
- 2024: 16,255
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Part D drug cost
Part D drug cost increased 5479% from $9,023 in 2020 to $503,403 in 2024.
- 2020: $9,023
- 2021: $10,264
- 2022: $9,701
- 2023: $115,412
- 2024: $503,403
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $242.42 in 2023 to $183.58 in 2025.
- 2023: $242.42
- 2024: $157.40
- 2025: $183.58
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $183.58.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Exact Sciences Corporation |
Food and Beverage
In-kind items and services
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Cologuard Collection Kit | General | $28.31 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $24.37 |
| Abbott Laboratories |
Food and Beverage
In-kind items and services
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FREESTYLE LIBRE 3 | General | $23.70 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $22.55 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $19.56 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Ozempic | General | $19.52 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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TRELEGY ELLIPTA | General | $16.47 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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— | General | $14.89 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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— | General | $14.21 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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129 | 56 | $348.52 | $91.69 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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58 | 37 | $340.55 | $129.31 |
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36415
Insertion of needle into vein for collection of blood sample
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39 | 28 | $35.77 | $8.65 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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37 | 37 | $426.93 | $129.66 |
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G0444
Annual depression screening, 5 to 15 minutes
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30 | 30 | $81.65 | $18.68 |
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G0442
Annual alcohol misuse screening, 5 to 15 minutes
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15 | 15 | $77.96 | $18.82 |
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71046
X-ray of chest, 2 views
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11 | 11 | $147.40 | $33.38 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 416 | 33,826 | $2,442.15 | 145 |
| Amlodipine Besylate | Amlodipine Besylate | 327 | 26,599 | $785.94 | 114 |
| Losartan Potassium | Losartan Potassium | 279 | 23,188 | $1,725.27 | 98 |
| Metformin Hcl | Metformin Hcl | 229 | 18,572 | $629.19 | 78 |
| Levothyroxine Sodium | Levothyroxine Sodium | 222 | 16,903 | $1,568.98 | 68 |
| Lisinopril | Lisinopril | 196 | 15,158 | $796.75 | 65 |
| Pantoprazole Sodium | Pantoprazole Sodium | 184 | 13,300 | $1,214.77 | 69 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 179 | 14,970 | $1,177.74 | 61 |
| Alprazolam | Alprazolam | 168 | 4,825 | $553.49 | 44 |
| Metoprolol Succinate | Metoprolol Succinate | 152 | 11,760 | $1,495.76 | 58 |
| Tizanidine Hcl | Tizanidine Hcl | 152 | 4,725 | $644.17 | 46 |
| Omeprazole | Omeprazole | 144 | 11,860 | $606.47 | 50 |
| Gabapentin | Gabapentin | 140 | 7,364 | $894.97 | 59 |
| Carvedilol | Carvedilol | 138 | 11,513 | $691.86 | 47 |
| Nifedipine Er | Nifedipine | 123 | 9,272 | $2,590.35 | 39 |
| Hydrochlorothiazide | Hydrochlorothiazide | 122 | 9,567 | $413.76 | 44 |
| Tramadol Hcl | Tramadol Hcl | 112 | 3,209 | $1,035.52 | 25 |
| Temazepam | Temazepam | 104 | 3,081 | $422.47 | 23 |
| Tamsulosin Hcl | Tamsulosin Hcl | 100 | 7,905 | $615.72 | 37 |
| Eliquis | Apixaban | 96 | 4,535 | $86,295.74 | 32 |
| Fluticasone Propionate | Fluticasone Propionate | 94 | 4,868 | $1,162.65 | 49 |
| Ezetimibe | Ezetimibe | 92 | 6,436 | $1,055.05 | 30 |
| Clopidogrel | Clopidogrel Bisulfate | 86 | 6,947 | $771.40 | 28 |
| Simvastatin | Simvastatin | 83 | 7,110 | $235.85 | 32 |
| Furosemide | Furosemide | 83 | 5,146 | $210.86 | 29 |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-06-23NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20091212000100
FL
3274673819
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Accountable Teaching Services Llc
10101 Forest Hill Blvd, Wellington, FL 334146103
Phone: 5617661301
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Advanced Registered Nurse Practitioner
Family Medicine
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Advanced Practice Registered Nurse
Internal Medicine
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 11700 OKEECHOBEE BLVD, ROYAL PALM BEACH, FL 334118721 (Tel: 5617900789)
Registered at 11700 OKEECHOBEE BLVD, ROYAL PALM BEACH, FL 334118721 (Tel: 5617900789)
NPI status registered as active in NPPES database
Registered at 1000 W MORENO ST, PENSACOLA, FL 325012316 (Tel: 8504344011)
Registered at 102 W. PINELOCH AVE, SUITE 21, ORLANDO, FL 328066100 (Tel: 4074817471)
Recorded as NATHANIEL FLEISCHNER, M.D.
Internal Medicine (license number reported to NPPES: FL ME105685)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Royal Palm Beach
- Dr. Sasha Baker, MD
- Dr. Abelardo Escriba Omar, MD
- Dr. David Roman, MD
- Dr. Gina Joseph, MD
- Dr. Aris Sahagian, MD
- Dr. William Stechschulte, DO
Mailing Address
11700 Okeechobee Blvd
Royal Palm Beach, FL 334118721
Phone: 5617900789