1. Home
  2. Directory
  3. Florida
  4. St Petersburg
  5. Emergency Medicine
  6. NPI Profile

ALEXANDER NICHOLAS DIAZ MD
NPI 1841751849
Emergency Medicine in St Petersburg, FL

Active since March 31, 2019PECOS EnrolledAccepts Medicare Assignment
500 DR MARTIN LUTHER KING JR ST N STE 304, ST PETERSBURG, FL 33705(727) 210-5253(727) 290-4323 Get Directions Write a Review

NPPES record last updated: August 2, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Alexander Nicholas Diaz Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXANDER NICHOLAS DIAZ MD (NPI 1841751849) is an individual emergency medicine provider in St Petersburg, Florida, licensed in Florida (ME167124) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with St Anthonys Hospital, and is a graduate of Univ Of Central Florida, College Of Medicine (2019).

NPPES Registry Identity

NPI1841751849
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameALEXANDER NICHOLAS DIAZCredential: MD
Location Address500 DR MARTIN LUTHER KING JR ST N STE 304St Petersburg, FL 33705-1470
Mailing Address3218 21st St NSt Petersburg, FL 33713-3055 · (954) 218-1166
Phone(727) 210-5253
Fax(727) 290-4323
Sole ProprietorYes
Medical School CMSUniv Of Central Florida, College Of MedicineGraduated 2019
Enumeration DateMarch 31, 2019
Last NPPES UpdateAugust 2, 2025
NPPES CertifiedAugust 2, 2025
✔ NPI 1841751849 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in FL · ME167124✔ Licensed in TX · T3460
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
500 DR MARTIN LUTHER KING JR ST N STE 304, St Petersburg, FL 33705
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Antidote Health of TX, Blue Cross and Blue Shield of Texas, Oscar Health Maintenance Organization of Florida and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alexander Nicholas Diaz Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1759760291
PECOS Enrollment IDI20250123000653
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

7

Medicare enrollment records show Alexander Diaz reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Bayside Emergency Physicians PA
1.1 mi
Emergency Medicine
1200 7TH AVE N
St Petersburg, FL 33705
  • Reassigned Medicare billing, Florida enrollment
  • 38 clinicians in this Medicare group
NPI 1396171518 (727) 825-1100
Paragon Emergency Services LLC
59 mi
Emergency Medicine
200 AVENUE F NE
Winter Haven, FL 33881
  • Reassigned Medicare billing, Florida enrollment
  • 1,065 clinicians in this Medicare group
NPI 1912101650 (863) 293-1121
Emergency Medicine Services Of Fl, LLC
198 mi
Emergency Medicine
20900 BISCAYNE BLVD
Aventura, FL 33180
  • Reassigned Medicare billing, Florida enrollment
  • 1,912 clinicians in this Medicare group
NPI 1043917180 (305) 682-7000
Victoria Emergency Partners LLC
905 mi
Emergency Medicine
1110 N SARAH DEWITT DR
Gonzales, TX 78629
  • Reassigned Medicare billing, Texas enrollment
  • 430 clinicians in this Medicare group
NPI 1164770996 (830) 672-7581
Travis County Emergency Physicians PA
929 mi
Emergency Medicine
1201 W 38TH ST
Austin, TX 78705
  • Reassigned Medicare billing, Texas enrollment
  • 1,511 clinicians in this Medicare group
NPI 1962440933 (330) 493-4443
Usacs Integrated Acute Care Services Of Texas, PLLC
935 mi
Internal Medicine
1401 MEDICAL PKWY
Cedar Park, TX 78613
  • Reassigned Medicare billing, Texas enrollment
  • 828 clinicians in this Medicare group
NPI 1801300322 (330) 493-4443
Acs Primary Care Physicians Southwest, PA
953 mi
Emergency Medicine
1900 HOSPITAL BLVD
Gainesville, TX 76240
  • Reassigned Medicare billing, Texas enrollment
  • 1,193 clinicians in this Medicare group
NPI 1538101019 (925) 924-1600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
147 services143 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
136 services124 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
64 services63 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
51 services51 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

St Anthonys Hospital

Acute Care Hospitals · Saint Petersburg, FL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number100067
Location1200 Seventh Ave NSaint Petersburg, FL 33705 · Pinellas County
Emergency services

Hca Florida Blake Hospital

Acute Care Hospitals · Bradenton, FL
1/5 CMS rating
OwnershipProprietary
CMS Certification Number100213
Location2020 59th St WBradenton, FL 34209 · Manatee County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 33705 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$87.62 typical visit price
range $56.00 – $171.84
Typical copayment $21.90 (range $14.00 – $42.96)
Most-billed visit code 99203
Established Patient
$99.16 typical visit price
range $17.57 – $139.16
Typical copayment $24.79 (range $4.39 – $34.79)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alexander Diaz's NPI number?

The NPI number for Alexander Diaz is 1841751849. It was assigned to this individual provider in the NPPES registry on March 31, 2019.

Where is Alexander Diaz located?

Alexander Diaz practices at 500 Dr Martin Luther King Jr St N Ste 304, St Petersburg, FL 33705. The listed phone number is (727) 210-5253.

What is Alexander Diaz's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Alexander Diaz enrolled in Medicare?

Yes. Alexander Diaz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Alexander Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Diaz reassigns Medicare benefits to 7 organizations: Bayside Emergency Physicians PA (St Petersburg, FL), Paragon Emergency Services LLC (Winter Haven, FL), Emergency Medicine Services Of Fl, LLC (Aventura, FL), Victoria Emergency Partners LLC (Gonzales, TX), Travis County Emergency Physicians PA (Austin, TX) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alexander Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Alexander Diaz accept?

Health plans from Antidote Health of TX, Blue Cross and Blue Shield of Texas, Oscar Health Maintenance Organization of Florida and Sendero Health Plans, Local Nonprofit list Alexander Diaz as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Alexander Diaz affiliated with any hospitals?

According to CMS data, Alexander Diaz is affiliated with St Anthonys Hospital and Hca Florida Blake Hospital.

When was this NPI record last updated?

The NPPES record for Alexander Diaz was last updated on August 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.