Masaru Chiba, MD

Medicare activity in 2024

Official CMS public-use data for Masaru Chiba, 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)180 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)170 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)119 services
4. Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)29 services
5. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)20 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%
• Heart failure51%
• Diabetes49%
• COPD48%

Hospitals where Masaru Chiba works

Medicare's Facility Affiliation Data lists Masaru Chiba 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.

• Monument Health Rapid City HospitalRapid City, SD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 430077

Practice locations

Addresses where Masaru Chiba is enrolled with Medicare (CMS data updated October 2, 2026).

• 353 Fairmont BlvdRapid City, SD 57701 (844) 641‑5134

Group practices

Medicare enrollment lists Masaru Chiba as a member of this group (CMS data updated October 2, 2026).

• Monument Health Rapid City Hospital Inc564 clinicians in the group

Specialties

• Pulmonary Diseaseprimary

Find other Pulmonary Disease doctors in South Dakota →

Other pulmonologists in Rapid City

Clinicians with the same Medicare primary specialty in Rapid City, SD — not a recommendation.

• Thomas S. Lemire, MD
• Javier E. Bogarin Geymayr, MD
• Cliff R. Janikowski, MD
• Anuj Shivalingaiah, MD
• Lalith Uragoda, MD
• James A. Washburn, MD

All pulmonologists in Rapid City →

Other clinicians in Monument Health Rapid City Hospital Inc

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

• Jessica L. Hart, NP
• Thomas M. Brockhoft, MD
• K J. Heilman Iii, MD
• Gaddiel D. Rios, MD
• Saverio J. Barbera, MD
• Christopher P. Barrozo, PA

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