JOHN L HERZOG SR. MD
NPI 1093734949
Internal Medicine - Cardiovascular Disease in Greenville, MS

Q: What is John Herzog's NPI number?

The NPI number for John Herzog is 1093734949. It was assigned to this individual provider in the NPPES registry on July 19, 2006.

Q: What is John Herzog's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Q: When was this NPI record last updated?

The NPPES record for John Herzog was last updated on August 21, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 19, 2006PECOS Enrolled

80.88/100

CMS Quality Rating

1421 E UNION ST, GREENVILLE, MS 38703(662) 335-0183(662) 335-7184 Get Directions Write a Review

NPPES record last updated: August 21, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About John L Herzog Sr. Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN L HERZOG SR. MD (NPI 1093734949) is an individual cardiovascular disease provider in Greenville, Mississippi, licensed in Mississippi (09800) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Northwest Missississippi Regional Medical Center, and is a graduate of University Of Mississippi School Of Medicine (1981).

NPPES Registry Identity

NPI1093734949

Entity TypeIndividualMale

Primary Taxonomy207RC0000X

Provider Legal NameJOHN L HERZOG SR.Credential: MD

Location Address1421 E UNION STGreenville, MS 38703-3247

Mailing AddressPo Box 5368Greenville, MS 38704-5368 · (662) 394-0107 · Fax (662) 335-7184

Phone(662) 335-0183

Fax(662) 335-7184

Sole ProprietorYes

Medical School CMSUniversity Of Mississippi School Of MedicineGraduated 1981

Enumeration DateJuly 19, 2006

Last NPPES UpdateAugust 21, 2020

NPPES CertifiedAugust 21, 2020

✔ NPI 1093734949 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RC0000X

License✔ Licensed in MS · 09800

Definition

An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

1421 E UNION ST, Greenville, MS 38703

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Other Identifiers 3

Medicaid126236001AR

Other060000624MS · Medicare

Medicaid00123017MS

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John L Herzog Sr. Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID1355390964

PECOS Enrollment IDI20110128000684

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show John Herzog reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Delta Heart & Vascular Center, P.A.

Same address

Health Service

1421 E UNION ST
Greenville, MS 38703

Reassigned Medicare billing, Mississippi enrollment
3 clinicians in this Medicare group

NPI 1174506281 (662) 335-0183

Delta Medical Group

2.5 mi

Emergency Medicine

1693 FAIRGROUNDS RD
Greenville, MS 38703

Reassigned Medicare billing, Mississippi enrollment
123 clinicians in this Medicare group

NPI 1790701134 (662) 725-2749

Advanced Medical Imaging Of Greenwood LLC

50 mi

Vascular & Interventional Radiology

410 E WASHINGTON ST
Greenwood, MS 38930

Reassigned Medicare billing, Mississippi enrollment
2 clinicians in this Medicare group

NPI 1982283008 (662) 335-0183

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 48

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, atropine sulfate, 0.01 mg J0461

Atropine sulfate is a medication given via injection to regulate heart rate or treat certain types of poisoning. The 0.01 mg dosage is carefully measured to provide effective, safe treatment.

4,300 services51 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

2,101 services226 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

1,973 services208 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

635 services282 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

502 services351 patients

Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308

A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.

249 services29 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

238 services226 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

192 services190 patients

Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309

A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.

186 services34 patients

Injection, dobutamine hydrochloride, per 250 mg J1250

Dobutamine hydrochloride is a medication that is injected into the body to improve heart function. It helps the heart pump blood more efficiently, which can be beneficial for conditions like heart failure or after a heart attack. It is administered per 250 mg dosage.

161 services81 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

156 services102 patients

Hospital discharge day management, 30 minutes or less 99238

Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.

152 services122 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

143 services112 patients

Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month 99439

Chronic Care Management services involve regular check-ins with healthcare professionals to manage two or more chronic conditions. It includes an additional 20 minutes of clinical staff time per month, directed by a healthcare professional, to ensure optimal health management.

106 services36 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

89 services76 patients

Ultrasound of heart blood flow, valves and chambers 93320

An ultrasound of your heart, also known as an echocardiogram, is a test that uses sound waves to create detailed images of your heart. It helps doctors check the health of your heart's chambers, valves, and blood flow.

81 services81 patients

Ultrasound of heart with color-depicted blood flow, rate and valve function 93325

An ultrasound of the heart, also known as an echocardiogram, uses sound waves to create pictures of your heart. It shows the structure, movement, and blood flow within your heart. This helps assess the heart's health and function, including the valves and rate.

81 services81 patients

Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report 93351

This procedure involves using ultrasound technology to create images of your heart while you rest, exercise, or undergo drug-induced stress. An ECG continuously monitors your heart's electrical activity. It helps doctors assess heart health and function.

80 services80 patients

Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist 93458

This procedure involves placing a tube into your left lower heart chamber and coronary artery. It helps doctors diagnose heart conditions by allowing them to view these areas in detail. A radiologist will review the images to ensure accurate diagnosis.

74 services70 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

70 services63 patients

Ultrasound of leg arteries or artery grafts 93925

An ultrasound of leg arteries or artery grafts is a non-invasive imaging test. It uses high-frequency sound waves to capture live images from inside your body, specifically your leg arteries or grafts. This helps in detecting any blockages or abnormalities.

66 services63 patients

Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts 93978

This procedure involves using sound waves to create images of your aorta, vena cava, groin vessels, or bypass grafts. It helps to detect abnormalities or blockages, ensuring your blood flows smoothly. It's painless and non-invasive.

66 services63 patients

Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month 99490

Chronic care management services involve a healthcare professional directing clinical staff in managing your chronic conditions. This includes the first 20 minutes per month of services like medication management, care coordination, and health monitoring to help improve your health and quality of life.

63 services37 patients

Use of a drug to induce depression of consciousness by physician performing a procedure, each additional 15 minutes 99153

This service involves a physician administering medication to lower your consciousness during a procedure. It's done for your comfort and safety. The drug's effects last about 15 minutes, so additional doses may be given as needed.

61 services19 patients

Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional 93228

An Electrocardiogram (ECG) is a non-invasive test that records the electrical signals in your heart. For up to 30 days, a small device will continuously monitor your heart's activity. A healthcare professional will then review the data and provide a report on your heart's function.

51 services48 patients

Electrocardiogram (ecg) up to 30 days continuous with transmission of patient triggered events with review and report by health care professional 93229

An Electrocardiogram (ECG) is a test that records your heart's electrical activity for up to 30 days. You trigger a transmission if you feel symptoms, which is then reviewed by a healthcare professional. The report helps diagnose heart conditions.

49 services47 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

37 services37 patients

Complete ultrasound scan behind abdominal cavity 76770

A complete ultrasound scan behind the abdominal cavity is a non-invasive imaging procedure. It uses sound waves to create pictures of the structures and organs located at the back of your abdomen. It helps in diagnosing health conditions and monitoring ongoing treatments.

35 services34 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system 93288

An evaluation of a pacemaker system examines how well your heart device is working. Single, dual, multiple lead, or leadless refers to the wires that deliver electrical pulses from the pacemaker to your heart. This check ensures your heart is receiving the right amount of support from the device.

32 services20 patients

Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes 99305

An initial nursing facility visit per day is a service where a healthcare professional spends about 35 minutes assessing a patient's health status. This includes reviewing medical history, conducting a physical exam, and developing a care plan based on the patient's needs.

30 services30 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

29 services27 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician 93016

An exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.

26 services26 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician 93018

An exercise or drug-induced heart stress test with ECG is a procedure to assess how your heart functions under stress. It can involve exercising or medication to make your heart work harder while an ECG records its activity. A physician reviews the results.

26 services26 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) 93017

An exercise or drug-induced heart stress test with an ECG checks how your heart responds to stress. You'll either exercise on a treadmill or be given medication to stress your heart. An ECG then captures your heart's activity, helping detect any issues.

24 services24 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

24 services19 patients

Insertion of non-tunneled central venous tube for infusion (5 years or older) 36556

This procedure involves placing a thin tube into a large vein, usually in the neck or chest, to administer medication or fluids. It's done under local anesthesia to minimize discomfort. It's a standard, safe procedure for individuals aged 5 and above.

20 services14 patients

Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional 99211

This service involves an outpatient visit for established patients who may not need direct interaction with a healthcare professional. It could include reviewing test results, monitoring existing conditions, or adjusting treatment plans. It's typically done remotely, ensuring your comfort and convenience.

19 services16 patients

Removal of plaque in arteries of leg 37225

This procedure, known as atherectomy, involves clearing out plaque buildup in the leg arteries. Plaque can restrict blood flow, causing discomfort and potential health issues. A special device is inserted into the artery to carefully remove the plaque, improving blood circulation.

18 services15 patients

Ultrasound of heart with probe in esophagus, with report 93312

This procedure, called a transesophageal echocardiogram, uses a small probe passed into your esophagus to capture detailed images of your heart. The report provides information about your heart's structure and function.

18 services18 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

18 services15 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician 93016

16 services16 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician 93018

16 services16 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

16 services16 patients

Ultrasound of leg arteries or artery grafts 93925

16 services16 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

16 services16 patients

Insertion of tube in right heart chambers for measurement 93451

This procedure involves placing a small, flexible tube into the right side of your heart. It helps assess how your heart is functioning by measuring pressures within the heart chambers. It's a key tool in diagnosing certain heart conditions.

15 services15 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

12 services12 patients

Ultrasound of both sides of head and neck blood flow 93880

11 services11 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northwest Missississippi Regional Medical Center

Acute Care Hospitals · Clarksdale, MS

OwnershipProprietary

CMS Certification Number250042

Location1970 Hospital DriveClarksdale, MS 38614 · Coahoma County

Emergency services Birthing friendly

Delta Health System - The Medical Center

Acute Care Hospitals · Greenville, MS

1/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number250082

Location1400 E Union Street / PO Box 5247Greenville, MS 38704 · Washington County

Emergency services Birthing friendly

Bolivar Medical Center

Acute Care Hospitals · Cleveland, MS

3/5 CMS rating

OwnershipProprietary

CMS Certification Number250093

Location901 E Sunflower RdCleveland, MS 38732 · Bolivar County

Emergency services

South Sunflower County Hospital

Acute Care Hospitals · Indianola, MS

OwnershipGovernment - Local

CMS Certification Number250095

Location121 East Baker StreetIndianola, MS 38751 · Sunflower County

Emergency services Birthing friendly

Greenwood Leflore Hospital

Acute Care Hospitals · Greenwood, MS

1/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number250099

Location1401 River RdGreenwood, MS 38930 · Leflore County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 38703 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$120.41 typical visit price

range $51.65 – $159.18

Typical copayment $30.10 (range $12.91 – $39.79)

Most-billed visit code 99204

Established Patient

$64.96 typical visit price

range $16.15 – $129.61

Typical copayment $16.24 (range $4.03 – $32.40)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.88/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Promoting Interoperability

Improvement Activities

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Manual wheelchair accessory, anti-tipping device, each E0971

DME-Wheelchairs · category DD021N

1 supplier14 claims28 services$3.35 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

3 suppliers19 claims19 services$105.76 avg. paid by Medicare

Standard wheelchair K0001

DME-Wheelchairs · category DD000N

1 supplier13 claims13 services$25.27 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DELTA HEART & VASCULAR CENTER, P.A.

Clinic/Center (Health Service)

1421 E UNION ST
GREENVILLE, MS 38703

Washington County (662) 335-0183

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Herzog's NPI number?

The NPI number for John Herzog is 1093734949. It was assigned to this individual provider in the NPPES registry on July 19, 2006.

Where is John Herzog located?

John Herzog practices at 1421 E Union St, Greenville, MS 38703. The listed phone number is (662) 335-0183.

What is John Herzog's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is John Herzog enrolled in Medicare?

Yes. John Herzog is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for John Herzog's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Herzog reassigns Medicare benefits to 3 organizations: Delta Heart & Vascular Center, P.A. (Greenville, MS), Delta Medical Group (Greenville, MS) and Advanced Medical Imaging Of Greenwood LLC (Greenwood, MS). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Herzog's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Herzog accept?

Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter of Alabama and Ambetter of Tennessee and 1 other insurer list John Herzog as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is John Herzog affiliated with any hospitals?

According to CMS data, John Herzog is affiliated with Northwest Missississippi Regional Medical Center, Delta Health System - The Medical Center, Bolivar Medical Center, South Sunflower County Hospital and Greenwood Leflore Hospital.

When was this NPI record last updated?

The NPPES record for John Herzog was last updated on August 21, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.