John L. Herzog Sr., MD

Medicare activity in 2024

Official CMS public-use data for John L. Herzog Sr., 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. Injection, atropine sulfate, 0.01 mg (J0461)4,300 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)2,101 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)1,973 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)635 services
5. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)502 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 cholesterol73%
• Diabetes48%
• Arthritis47%
• Ischemic heart disease43%
• Heart failure42%

Hospitals where John L. Herzog Sr. works

Medicare's Facility Affiliation Data lists John L. Herzog Sr. 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.

• Bolivar Medical CenterCleveland, MS · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 250093
• Delta Health System - The Medical CenterGreenville, MS · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 250082
• Greenwood Leflore HospitalGreenwood, MS · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 250099
• Northwest Missississippi Regional Medical CenterClarksdale, MS · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 250042
• South Sunflower County HospitalIndianola, MS · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 250095

Practice locations

Addresses where John L. Herzog Sr. is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 122 E Baker StIndianola, MS 38751 (662) 335‑0183
• 1400 E Union StGreenville, MS 38703 (662) 378‑3783
• 1421 E Union StGreenville, MS 38703
• 1513 E Union StGreenville, MS 38703 (662) 846‑6034
• 1693 Fairgrounds RdGreenville, MS 38703 (662) 378‑3783

Group practices

Medicare enrollment lists John L. Herzog Sr. as a member of these groups (CMS data updated October 2, 2026).

• Delta Medical Group48 clinicians in the group
• Delta Heart and Vascular Center, P.A.4 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary
• Internal Medicinealso

Find other Cardiovascular Disease (Cardiology) doctors in Mississippi →

Other cardiologists in Mississippi

Clinicians with the same Medicare primary specialty in Mississippi — not a recommendation.

• William W. Dowell, MD
• Kerry D. Morgan, MD
• Thor Goodfellow, MD
• Mit V. Patel, MD
• James D. Pollard, MD
• Berthrone L. Mock-Muhammad, MD
• Douglas L. Hill, MD
• Paul W. Pierce Iv, MD

All cardiologists in Mississippi →

Other clinicians in Delta Medical Group

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

• Aman U. Munir, MD
• Jaiyeola O. Adeleye, MD
• Yakitta Landrum-Lovett, NP
• Jason R. Schwanebeck, MD
• Robert Brunston, MD
• Deepali R. Kale, 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