Justin N. Grammy, DO

Medicare activity in 2024

Official CMS public-use data for Justin N. Grammy, 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.

Most frequent services

1. Critical care, first 30-74 minutes (99291)190 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)66 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%
• Ischemic heart disease55%
• Atrial fibrillation55%
• Heart failure54%
• Arthritis45%

Hospitals where Justin N. Grammy works

Medicare's Facility Affiliation Data lists Justin N. Grammy 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.

• Adventist Health Sierra VistaSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050506
• Adventist Health Twin CitiesTempleton, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050633
• French Hospital Medical CenterSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050232
• Marian Regional Medical CenterSanta Maria, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050107

Practice locations

Addresses where Justin N. Grammy is enrolled with Medicare (CMS data updated October 2, 2026).

• 1010 Murray AveSan Luis Obispo, CA 93405 (805) 543‑4407
• 1428 Phillips Ln, Suite 203San Luis Obispo, CA 93401 (805) 543‑4407
• 1911 Johnson AveSan Luis Obispo, CA 93401 (805) 543‑4407

Group practices

Medicare enrollment lists Justin N. Grammy as a member of this group (CMS data updated October 2, 2026).

• Central Coast Chest Consultants, a Medical Corporation8 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in San Luis Obispo

Clinicians with the same Medicare primary specialty in San Luis Obispo, CA — not a recommendation.

• Brian S. Penton, MD
• Samkit Jain, MD
• Yong Ha Jeon, MD
• Nikita M. Patel, MD
• Mehrab Devani, MD
• Stephen A. Hilty, MD
• Gayle S. Cekada, MD
• Nicholas Placone, MD

All internal medicine doctors in San Luis Obispo →

Other clinicians in Central Coast Chest Consultants, a Medical Corporation

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Michael J. Ryan, MD
• Shinkai Hakimi, MD
• Gregory S. Canfield, MD

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians