William Marshall Portnoy, M.D.
Otolaryngology Physician · Miami, FL
William Marshall Portnoy, M.D. is an otolaryngology physician with a practice address in Miami, Florida, and NPI 1104913185, issued on Oct 9, 2006. Check the license (Florida 150098, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- William Marshall Portnoy
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License numbers
- 150098 FL
175480 NY
Self-reported in NPPES; status is on the state search - Practice location
- 3100 SW 62ND Ave Ste 124, Miami, FL 33155
- Phone
- (305) 662-8377
- Enumerated
- Oct 9, 2006
- Record last updated
- Jul 7, 2022
- Fax
- (305) 663-8513
- Medicaid ID
- 01634500 NY
- Medicare enrollment
- Enrolled (PECOS I20221115001634); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 659 in Florida → Look up another NPI →
Also registered at 3100 SW 62ND Ave Ste 124
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ottoniel Hernandez, NPFamily Nurse Practitioner1053054072
- Ivan Perez Hernandez, ARNPFamily Nurse Practitioner1093228298
Verify William Marshall Portnoy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license 150098Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average otolaryngology physician in 2024
454 Medicare Part D claims for 239 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Methylprednisolone172 claims
- Tobramycin-Dexamethasone85 claims
- Mometasone Furoate39 claims
- Esomeprazole Magnesium25 claims
- Amoxicillin17 claims
- Azithromycin14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $28.52
1 payment: food and beverage; the largest payer was Optinose US, Inc. The 6,429 providers of this specialty with any payment received $1,922.50 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Ent And Allergy Associates OF Florida, LLCBoca Raton, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Marshall Portnoy among 659 otolaryngology physician records in Florida
William Marshall Portnoy, M.D. is one of 659 otolaryngology physician records with a practice address in Florida. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 19% of them.
- NPI issued2006 · 19% of these records are older, 46% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1987 · median 2002 among the 470 with a school on file
- Record last updated2022 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in Florida
There are 659 otolaryngology physician records in Florida.
All 659 in Florida → Every provider in Miami → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Brian Ho, M.D.Miami, FL 331551114248440
- Andres Orjuela, M.D.Miami, FL 331551588687933
- Rafael Portela, M.D.Miami, FL 331551134386675
- Pedro Villalonga, MDMiami, FL 331551184610354
- Pablo Arango, M.D.Miami, FL 331561639127798
- Jennifer Hanlon, M.D.Miami, FL 331561891144911
- Jose Alonso, MDPalmetto Bay, FL 331571386095206
- Alan Chu, M.D.Palmetto Bay, FL 331571679725048
Common questions
What is William Marshall Portnoy, M.D.'s NPI number?
William Marshall Portnoy, M.D.'s National Provider Identifier (NPI) is 1104913185, issued on Oct 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Marshall Portnoy, M.D. located?
The NPPES record lists a practice address at 3100 SW 62ND Ave Ste 124, Miami, FL, 33155. Phone: (305) 662-8377. Providers update this record themselves, so call before visiting.
How can I verify William Marshall Portnoy, M.D.'s license?
NPPES lists Florida license number 150098, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Marshall Portnoy, M.D. prescribe under Medicare Part D?
In 2024, William Marshall Portnoy, M.D. had 454 Medicare Part D claims for 239 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.