Mahsa A. Massumi, MD

Medicare activity in 2024

Official CMS public-use data for Mahsa A. Massumi, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)275 services
2. Hospital discharge day management, more than 30 minutes (99239)64 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)26 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 disease65%
• Heart failure62%
• Chronic kidney disease61%
• Diabetes59%

Hospitals where Mahsa A. Massumi works

Medicare's Facility Affiliation Data lists Mahsa A. Massumi 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.

• Baylor St. Luke's Medical CenterHouston, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · CCN 450193

Practice locations

Addresses where Mahsa A. Massumi is enrolled with Medicare (CMS data updated October 2, 2026).

• 1919 Old Spanish TrlHouston, TX 77054
• 2 Greenway Plz, Suite 900Houston, TX 77046
• 6720 Bertner AveHouston, TX 77030
• 6770 Bertner Ave, Suite C 350Houston, TX 77030 (713) 798‑1000
• 7200 Cambridge StHouston, TX 77030

Group practices

Medicare enrollment lists Mahsa A. Massumi as a member of this group (CMS data updated October 2, 2026).

• Baylor College of Medicine1,240 clinicians in the group

Specialties

• Hospitalistprimary
• Internal Medicinealso

Find other Hospitalist doctors in Texas →

Other hospitalists in Houston

Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.

• Michael C. Shieh, MD
• Muhammad N. Khan, MD
• Ryan T. Le, MD
• Kashif J. Piracha, MD
• Marilynn Tedja, MD
• Salim N. Maredia, MD
• Michelle Lipman, MD
• Swathi Murali, MD

All hospitalists in Houston →

Other clinicians in Baylor College of Medicine

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

• Michael C. Shieh, MD
• Jaimie J. Joseph, NP
• Jenny B. Nguyen, MD
• John Berens, MD
• Alexandra Grand, MD
• Evan Li, 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