Quick answers
- Does John A. Masson Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Masson Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does John A. Masson Jr. see?
- In 2024, CMS data shows 611 Original Medicare patients and 1,881 services for John A. Masson Jr.. This counts Original Medicare only and measures volume, not quality.
- What is John A. Masson Jr.'s NPI number?
- 1134100605. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for John A. Masson Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 611 |
|---|---|
| Services billed to Medicare | 1,881 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)348 services
- Critical care, first 30-74 minutes (99291)338 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)241 services
- Test to examine how well the lungs exchange gases (94729)165 services
- Test to determine lung volumes using sensors (94726)158 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis60%
- Ischemic heart disease60%
- COPD53%
- Chronic kidney disease45%
Hospitals where John A. Masson Jr. works
Medicare's Facility Affiliation Data lists John A. Masson Jr. at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- AdventHealth North PinellasTarpon Springs, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100055
- Mease Countryside HospitalSafety Harbor, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100265
- Mease Dunedin HospitalDunedin, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100043
- Morton Plant HospitalClearwater, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100127
Practice locations
Addresses where John A. Masson Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 2461 Enterprise Rd, Suite CClearwater, FL 33763 (727) 725‑5060
- 300 Pinellas StClearwater, FL 33756 (727) 461‑8231
- 3231 McMullen Booth RdSafety Harbor, FL 34695 (727) 725‑6526
- 3231 McMullen Booth Rd, Suite 551Safety Harbor, FL 34695 (727) 725‑6526
- 430 Morton Plant St, Suite 405Clearwater, FL 33756 (727) 443‑0611
Group practices
Medicare enrollment lists John A. Masson Jr. as a member of these groups (CMS data updated October 2, 2026).
- BayCare Medical Group, Inc.1,547 clinicians in the group
- Bay Area Chest Physicians P A16 clinicians in the group
Specialties
Other pulmonologists in Clearwater
Clinicians with the same Medicare primary specialty in Clearwater, FL — not a recommendation.
Other clinicians in BayCare Medical Group, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134100605 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians