Dr. John Frederick Wissinger, MD
- Medicare services, 2018
- 1,066
- Part D claims, 2019
- 1,175
- Industry payments
- $13
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 1602 N Mechanic St, El Campo, TX 77437-2640
- Practice phone
- Call (979) 543-2956
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
South Texas Medical Clinics
Multi-specialty group site · El Campo, Texas
Find Dr. Wissinger's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Frederick Wissinger is an internist in El Campo, Texas
Dr. Wissinger practices at South Texas Medical Clinics in El Campo, Texas.
Dr. Wissinger's NPI, 1558326876, was assigned on April 19, 2006. Dr. Wissinger graduated from UTMB Health in 1982. Dr. Wissinger's Texas license number on file is G3918.
- NPI
- 1558326876NPI Registry (opens in a new tab)
- NPI enumeration date
- April 19, 2006
- NPI status
- Active
- Practice phone
- (979) 543-2956
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Frederick Wissinger practices at South Texas Medical Clinics in El Campo, Texas
Dr. Wissinger's primary practice is South Texas Medical Clinics, at 1602 N Mechanic St, El Campo, TX 77437-2640. The practice phone is (979) 543-2956.
- South Texas Medical Clinics1602 N Mechanic St, El Campo, TX 77437-2640Phone(979) 543-2956
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Frederick Wissinger is affiliated with 1 site of care and 1 medical group
Dr. Wissinger's primary practice is South Texas Medical Clinics in El Campo, Texas. Dmand AI also links Dr. Wissinger to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. John Frederick Wissinger's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Wissinger practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| South Texas Medical Clinics | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Frederick Wissinger is one of 8,437 internists in Texas
Internal medicine is Dr. Wissinger's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Wissinger has a license on file in Texas.
Specialties and state licenses
- Internal medicine, TexasPrimary
Internists near Dr. Wissinger
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Frederick Wissinger billed Medicare for 1,066 services in 2018
CMS data shows 1,066 Medicare services from Dr. Wissinger across 5 procedure codes in 2018. Medicare paid $61,287 for them. Every service was in an office.
Dr. Wissinger's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 1,3632018: 98028%
- Imaging
- 2017: 1102018: 6145%
- Lab and pathology
- 2017: 412018: 2539%
- Tests and treatments
- 2017: 272018: 0100%
- Other services
- 2017: 642018: 0100%
Dr. Wissinger compared with the Texas median for internists, 2018
- Dr. Wissinger
- Texas median
- Medicare services
- 1,066vs 53998% above
- Part D claims
- 1,175vs 2894.1 times
Medians across 7,794 internists in Texas with Dmand AI profiles that report each measure.
Dr. Wissinger's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Wissinger?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Wissinger and other internists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Frederick Wissinger's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Wissinger's median patient age at 75, with 40% women.
Dr. Wissinger's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women40%
- Men58%
Source: Dmand AI Patient Panel Data
Dr. John Frederick Wissinger wrote 1,175 Medicare Part D claims in 2019
In 2019, Dr. Wissinger wrote 1,175 Medicare Part D claims. They cover 40 drugs, with $24,126 in total drug cost. In 2018, CMS named 8,041 claims across 127 drugs.
Dr. Wissinger's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 8,0412019: 1,17585%
Drugs named by CMS: 40 in 2019, 127 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. John Frederick Wissinger received $13 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Wissinger from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. Medline Industries, Inc. paid the most, $13.
Companies that paid Dr. Wissinger the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Frederick Wissinger graduated from UTMB Health
Dr. Wissinger graduated from UTMB Health in 1982.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. John Frederick Wissinger accepts plans from 1 insurance carrier
Dr. Wissinger is in network with 1 carrier, including Elevance. POS plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Elevance
Source: Dmand AI Insurance Network Data
Sources for Dr. John Frederick Wissinger's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Frederick Wissinger
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Frederick Wissinger's NPI number?
Dr. John Frederick Wissinger's NPI number is 1558326876. It was assigned on April 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Frederick Wissinger?
Dr. John Frederick Wissinger is an internist in El Campo, Texas. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John Frederick Wissinger practice?
Dr. Wissinger practices at 1602 N Mechanic St, El Campo, TX 77437-2640. Dr. Wissinger's primary practice is South Texas Medical Clinics in El Campo, Texas. Dmand AI also links Dr. Wissinger to 1 medical group.
What is Dr. John Frederick Wissinger's office phone number?
The practice phone on file for Dr. Wissinger is (979) 543-2956.
What is Dr. John Frederick Wissinger's medical license number?
Dr. Wissinger's Texas license number on file is G3918.
Does Dr. John Frederick Wissinger accept Medicare?
Yes. CMS data shows Dr. Wissinger billed Medicare for 1,066 services in 2018.
What services does Dr. John Frederick Wissinger bill to Medicare?
In 2018, Dr. Wissinger's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and diagnostic imaging (71046).
Where did Dr. John Frederick Wissinger go to medical school?
Dr. Wissinger graduated from UTMB Health in 1982.
What drugs does Dr. John Frederick Wissinger prescribe most?
In 2019 Medicare Part D data, Dr. Wissinger's most prescribed drugs by claims were Amlodipine Besylate, Levothyroxine Sodium and Losartan Potassium.
Has Dr. John Frederick Wissinger received payments from drug or device companies?
CMS Open Payments shows $13 in general payments to Dr. Wissinger from 1 company from 2021 to 2021. The largest total came from Medline Industries, Inc.
How long has Dr. John Frederick Wissinger been practicing?
Dr. Wissinger graduated from medical school in 1982, 44 years ago.
What insurance does Dr. John Frederick Wissinger accept?
Dr. Wissinger is in network with 1 carrier, including Elevance. POS plans come from the most carriers, 1. Check the plan with the practice before a visit.
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