Clark B. Zimmerman Iv, MD

Medicare activity in 2024

Official CMS public-use data for Clark B. Zimmerman Iv, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)366 services
2. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)67 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)27 services
4. Insertion of needle into vein for collection of blood sample (36415)22 services
5. Automated urinalysis test (81003)19 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 cholesterol67%
• High blood pressure60%
• Arthritis51%
• Depression22%
• Anxiety22%
• Chronic kidney disease22%

Hospitals where Clark B. Zimmerman Iv works

Medicare's Facility Affiliation Data lists Clark B. Zimmerman Iv 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 Castle RockCastle Rock, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060125
• AdventHealth ParkerParker, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060114

Practice locations

Addresses where Clark B. Zimmerman Iv is enrolled with Medicare (CMS data updated October 2, 2026).

• 2535 S Downing StDenver, CO 80210 (303) 778‑5797
• 7750 S Broadway, 260 South Denver NeurosurgeryLittleton, CO 80122 (303) 734‑8650

Group practices

Medicare enrollment lists Clark B. Zimmerman Iv as a member of this group (CMS data updated October 2, 2026).

• Portercare Adventist Health System774 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in Colorado →

Other family doctors in Denver

Clinicians with the same Medicare primary specialty in Denver, CO — not a recommendation.

• Alden Zwerling, MD
• Mohammad Pourmandi, DO
• Christina Hughes, DO
• Melissa A. Biewenga, MD
• Ha V. Rio, DO
• Terry S. Krause, MD
• Oliver P. Loeffler, MD
• David J. Davis, MD

All family doctors in Denver →

Other clinicians in Portercare Adventist Health System

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

• Erin C. Zahradnik, PA
• Nipun B. Reddy, MD
• Erin D. Unger, MD
• Charles R. Santaniello, PA
• Kevin B. Miller, MD
• Ryan E. Smith, 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