Dr. John Mj Ernst, MD
- Medicare services, 2024
- 3,992
- Medicare patients, 2024
- 235
- Part D claims, 2024
- 42
- Industry payments
- $732
- Affiliated sites
- 3
- Practice address
- 316 Calhoun St, Charleston, SC 29401
- Practice phone
- Call (843) 724-2901
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Roper Hospital
Charleston, South Carolina
Find Dr. Ernst'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 Mj Ernst is an orthopaedic hand surgery physician in Charleston, South Carolina
Dr. Ernst practices at Roper Hospital in Charleston, South Carolina.
Dr. Ernst's NPI, 1619902905, was assigned on July 12, 2006. Dr. Ernst graduated from University of Rochester School of Medicine and Dentistry in 1979. Dr. Ernst holds South Carolina license 11777.
- NPI
- 1619902905NPI Registry (opens in a new tab)
- NPI enumeration date
- July 12, 2006
- NPI status
- Active
- Practice phone
- (843) 724-2901
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John Mj Ernst practices at Roper Hospital in Charleston, South Carolina
Dr. Ernst's primary practice is Roper Hospital, at 316 Calhoun St, Charleston, SC 29401 in Charleston County. The practice phone is (843) 724-2901.
- Roper Hospital316 Calhoun St, Charleston, SC 29401 · Charleston CountyPhone(843) 724-2901
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John Mj Ernst is affiliated with 4 sites of care and 3 medical groups
Dr. Ernst's primary practice is Roper Hospital in Charleston, South Carolina. The medical group on file is Roper St. Francis Physician Partners General Surgery. Dmand AI also links Dr. Ernst to 3 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John Mj Ernst's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ernst practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Roper Hospital | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Mj Ernst is one of 47 orthopaedic hand surgery physicians in South Carolina
Hand surgery is Dr. Ernst's primary specialty in the NPI Registry, under taxonomy code 207XS0106X. Dr. Ernst is licensed in South Carolina.
Specialties and state licenses
- Orthopaedic hand surgery, South CarolinaPrimary
Orthopaedic hand surgery physicians near Dr. Ernst
Counts of orthopaedic hand surgery physicians 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 Mj Ernst billed Medicare for 3,992 services in 2024
CMS data shows 3,992 Medicare services from Dr. Ernst across 15 procedure codes in 2024, for 235 Medicare patients. Medicare paid $48,832 for them.
Dr. Ernst's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 1882024: 3,2361621%
- Office and hospital visits
- 2023: 6002024: 44127%
- Surgery
- 2023: 2052024: 16320%
- Imaging
- 2023: 2932024: 15248%
Where Dr. Ernst's Medicare services took place, 2024
- In an office3,94499%
- In a facility481%
Dr. Ernst compared with the South Carolina median for orthopaedic hand surgery physicians, 2024
- Dr. Ernst
- South Carolina median
- Medicare services
- 3,992vs 1,6992.3 times
- Medicare patients
- 235vs 42445% below
- Part D claims
- 36vs 10365% below
Medians across 49 orthopaedic hand surgery physicians in South Carolina with Dmand AI profiles that report each measure.
Dr. Ernst's most billed Medicare procedure codes, 2024
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. Ernst?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ernst and other orthopaedic hand surgery physicians in South Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Mj Ernst treated 235 Medicare patients in 2024, average age 74
CMS counts 235 Medicare patients who saw Dr. Ernst in 2024. The largest group is 65 to 74, with 101 patients. 75% of them have high cholesterol, and 71% have high blood pressure. Their average risk score is 1.04, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ernst's median patient age at 72, with 58% women.
Dr. Ernst's Medicare patients by age, 2024
Dr. Ernst's Medicare patients by sex, 2024
- Women13156%
- Men10444%
Chronic conditions among Dr. Ernst's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis58%
- Anxiety26%
- Diabetes26%
- Mood disorders24%
- Ischemic heart disease22%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ernst's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women58%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Mj Ernst wrote 42 Medicare Part D claims in 2024
In 2024, Dr. Ernst wrote 42 Medicare Part D claims for 36 patients. 95% of them were for generic drugs. CMS names the drug for 36 of them, across 1 drug with 11 or more claims each, at $168 in total drug cost. In 2023, CMS named 20 claims across 1 drug.
Dr. Ernst's Part D claims by kind of drug, 2024
- Generic40 claims95%
- Brand-name and other2 claims5%
Dr. Ernst's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Ernst's Part D claims, 2024
- Opioids86%36 of 42 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 202024: 3680%
Drugs named by CMS: 1 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. John Mj Ernst received $732 in industry payments from 2016 to 2024
CMS Open Payments shows 14 general payments to Dr. Ernst from 9 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Integra LifeSciences Corporation paid the most, $232.
General payments to Dr. Ernst by program year, 2016 to 2024
Companies that paid Dr. Ernst the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Mj Ernst graduated from University of Rochester School of Medicine and Dentistry
Dr. Ernst graduated from University of Rochester School of Medicine and Dentistry in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Mj Ernst'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (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 |
| 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 Mj Ernst
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 Mj Ernst's NPI number?
Dr. John Mj Ernst's NPI number is 1619902905. It was assigned on July 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Mj Ernst?
Dr. John Mj Ernst is an orthopaedic hand surgery physician in Charleston, South Carolina. The primary specialty in the NPI Registry is Orthopaedic Hand Surgery Physician (taxonomy code 207XS0106X).
Where does Dr. John Mj Ernst practice?
Dr. Ernst practices at 316 Calhoun St, Charleston, SC 29401. Dr. Ernst's primary practice is Roper Hospital in Charleston, South Carolina. Dmand AI also links Dr. Ernst to 3 group practices and clinics and 2 medical groups.
What is Dr. John Mj Ernst's office phone number?
The practice phone on file for Dr. Ernst is (843) 724-2901.
What is Dr. John Mj Ernst's medical license number?
Dr. Ernst holds South Carolina license 11777.
What medical group is Dr. John Mj Ernst part of?
Dr. Ernst is linked to Roper St. Francis Physician Partners General Surgery. Dmand AI links Dr. Ernst to 2 more medical groups.
Does Dr. John Mj Ernst accept Medicare?
Yes. CMS data shows Dr. Ernst billed Medicare for 3,992 services in 2024.
How many Medicare patients does Dr. John Mj Ernst see?
CMS counts 235 Medicare patients who saw Dr. Ernst in 2024, with an average age of 74.
What services does Dr. John Mj Ernst bill to Medicare?
In 2024, Dr. Ernst's most billed Medicare services were injected or infused drug (J1010), office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. John Mj Ernst go to medical school?
Dr. Ernst graduated from University of Rochester School of Medicine and Dentistry in 1979.
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What drugs does Dr. John Mj Ernst prescribe most?
In 2024 Medicare Part D data, Dr. Ernst's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. John Mj Ernst received payments from drug or device companies?
CMS Open Payments shows $732 in general payments to Dr. Ernst from 9 companies from 2016 to 2024. The largest total came from Integra LifeSciences Corporation.
How long has Dr. John Mj Ernst been practicing?
Dr. Ernst graduated from medical school in 1979, 47 years ago.
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