Dr. Gretchen S. Johns, MD
- Medicare services, 2024
- 17,972
- Medicare patients, 2024
- 7,310
- Publications
- 13
- MIPS score, 2024
- 84
- Hospital affiliations
- 1
- Practice address
- 4500 San Pablo Rd, Jacksonville, FL 32224
- Practice phone
- Call (904) 953-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Johns' 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. Gretchen S. Johns is a clinical pathology/laboratory medicine physician in Jacksonville, Florida
Dr. Johns practices at Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic.
Dr. Johns' NPI, 1750301172, was assigned on July 20, 2006. Dr. Johns graduated from Saint Louis University School Of Medicine in 1995. Dr. Johns holds Florida license ME102727.
- NPI
- 1750301172NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032278353
- NPI enumeration date
- July 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (904) 953-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gretchen S. Johns practices at Mayo Clinic Hospital in Jacksonville, Florida
Dr. Johns' primary practice is Mayo Clinic Hospital, at 4500 San Pablo Rd, Jacksonville, FL 32224 in Duval County. The practice phone is (904) 953-2000.
- Mayo Clinic Hospital4500 San Pablo Rd, Jacksonville, FL 32224 · Duval CountyPhone(904) 953-2000
Source: Dmand AI Affiliation Data
Dr. Gretchen S. Johns is affiliated with 1 site of care and 1 medical group
Dr. Johns' primary practice is Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic. The medical group on file is Mayo Clinic Jacksonville.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gretchen S. Johns' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johns practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mayo Clinic Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gretchen S. Johns is one of 69 clinical pathology/laboratory medicine physicians in Florida
Clinical pathology/laboratory medicine is Dr. Johns' primary specialty in the NPI Registry, under taxonomy code 207ZP0105X. Dr. Johns is board certified in blood banking/transfusion medicine by the American Board of Pathology. Dmand AI has Dr. Johns' licenses on file in 3 states: Florida, Missouri and Georgia.
Specialties and state licenses
- Clinical pathology/laboratory medicine, FloridaPrimary
- Missouri license
- Georgia license
Clinical pathology/laboratory medicine physicians near Dr. Johns
Counts of clinical pathology/laboratory medicine 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. Gretchen S. Johns billed Medicare for 17,972 services in 2024
CMS data shows 17,972 Medicare services from Dr. Johns across 6 procedure codes in 2024, for 7,310 Medicare patients. Medicare paid $149,626 for them.
Dr. Johns' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 57,0952024: 16,27371%
- Lab and pathology
- 2023: 15,3792024: 1,69989%
Where Dr. Johns' Medicare services took place, 2024
- In an office17,928100%
- In a facility440%
Dr. Johns compared with the Florida median for clinical pathology/laboratory medicine physicians, 2024
- Dr. Johns
- Florida median
- Medicare services
- 17,972vs 1,31913.6 times
- Medicare patients
- 7,310vs 48615.0 times
Medians across 51 clinical pathology/laboratory medicine physicians in Florida with Dmand AI profiles that report each measure.
Dr. Johns' 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. Johns?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Johns and other clinical pathology/laboratory medicine physicians in Florida.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gretchen S. Johns treated 7,310 Medicare patients in 2024, average age 74
CMS counts 7,310 Medicare patients who saw Dr. Johns in 2024. The largest group is 65 to 74, with 3,335 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 4% are also on Medicaid. Their average risk score is 2.08, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Johns' median patient age at 48, with 76% women.
Dr. Johns' Medicare patients by age, 2024
Dr. Johns' Medicare patients by sex, 2024
- Women3,39146%
- Men3,91954%
Chronic conditions among Dr. Johns' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis46%
- Cancer34%
- Chronic kidney disease34%
- Ischemic heart disease34%
- Diabetes30%
- Anxiety29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johns' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women76%
- Men24%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gretchen S. Johns scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. Johns for performance year 2024, reported as part of a group. Dr. Johns accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Johns' MIPS scores, performance year 2024
- 84of 100Final score
- 74.8of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 73of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gretchen S. Johns has 13 publications on record
Dmand AI links 13 papers to Dr. Johns, published from 2012 to 2025. 2012 was the busiest year, with 2. The most frequent topics are Disease Progression, Echocardiography and von Willebrand Factor. Dr. Johns has published most often in J Vasc Interv Neurol. Dr. Johns' most frequent co-authors are Joseph L. Blackshear, MD, William D. Freeman, MD and Robert Eugene Safford, MD.
Dr. Johns' papers by year, 2012 to 2025
Topics Dr. Johns writes about most
- Disease Progression
- Echocardiography
- von Willebrand Factor
Dr. Johns' most frequent co-authors
- Joseph L. Blackshear, MD3 shared papers
- William D. Freeman, MD3 shared papers
- Robert Eugene Safford, MD3 shared papers
Recent publications by Dr. Johns
Mayo Clin Proc Innov Qual Outcomes
J Thromb Haemost
See who Dr. Johns researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johns works with, so you can find a warm path to the right clinical pathology/laboratory medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gretchen S. Johns received $73 in industry payments from 2021 to 2023
CMS Open Payments shows 4 general payments to Dr. Johns from 2 drug and device companies from 2021 to 2023. Speaker and faculty fees make up the largest share, 55% of the total. BioFire Diagnostics, LLC paid the most, $40.
General payments to Dr. Johns by program year, 2021 to 2023
General payments to Dr. Johns by kind, 2021 to 2023
- Speaker and faculty fees$4055%
- Food and beverage$3345%
Companies that paid Dr. Johns the most, 2021 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gretchen S. Johns graduated from Saint Louis University School Of Medicine
Dr. Johns graduated from Saint Louis University School Of Medicine in 1995.
- Medical school
- Board certified in blood banking/transfusion medicine
- Board certified in clinical pathology
Source: Dmand AI Professional Profile Data
Dr. Gretchen S. Johns accepts plans from 4 insurance carriers
Dr. Johns is in network with 4 carriers, including Excellus BlueCross BlueShield, Cigna and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
- Cigna
- CMS Medicare
- RI State Medicaid
Plan types Dr. Johns accepts, by number of carriers
- Medicare2
- PPO2
- EPO1
- HMO1
- Medicaid1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gretchen S. Johns'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 Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Gretchen S. Johns
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. Gretchen S. Johns' NPI number?
Dr. Gretchen S. Johns' NPI number is 1750301172. It was assigned on July 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gretchen S. Johns?
Dr. Gretchen S. Johns is a clinical pathology/laboratory medicine physician in Jacksonville, Florida. The primary specialty in the NPI Registry is Clinical Pathology/Laboratory Medicine Physician (taxonomy code 207ZP0105X).
Where does Dr. Gretchen S. Johns practice?
Dr. Johns practices at 4500 San Pablo Rd, Jacksonville, FL 32224. Dr. Johns' primary practice is Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic.
What is Dr. Gretchen S. Johns' office phone number?
The practice phone on file for Dr. Johns is (904) 953-2000.
What is Dr. Gretchen S. Johns' medical license number?
Dr. Johns holds Florida license ME102727, one of the licenses on file in 3 states.
Which states has Dr. Gretchen S. Johns been licensed in?
Dmand AI has state licenses on file for Dr. Johns in Florida (2008 to 2027), Missouri (1997 to 2026) and Georgia (2001 to 2025).
Which hospitals is Dr. Gretchen S. Johns affiliated with?
Dr. Johns practices at Mayo Clinic Hospital in Jacksonville, Florida.
What medical group is Dr. Gretchen S. Johns part of?
Dr. Johns is linked to Mayo Clinic Jacksonville.
Does Dr. Gretchen S. Johns accept Medicare?
Yes. CMS data shows Dr. Johns billed Medicare for 17,972 services in 2024, and Dr. Johns accepts Medicare assignment.
What is Dr. Gretchen S. Johns' MIPS score?
Dr. Johns' MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
Show 9 more questionsShow fewer questions
How many Medicare patients does Dr. Gretchen S. Johns see?
CMS counts 7,310 Medicare patients who saw Dr. Johns in 2024, with an average age of 74.
Is Dr. Gretchen S. Johns board certified?
Yes. Dr. Johns is board certified in blood banking/transfusion medicine by the American Board of Pathology.
What services does Dr. Gretchen S. Johns bill to Medicare?
In 2024, Dr. Johns' most billed Medicare services were surgery: heart and blood vessels (36415), lab and pathology test (85610) and lab and pathology test (82565).
Where did Dr. Gretchen S. Johns go to medical school?
Dr. Johns graduated from Saint Louis University School Of Medicine in 1995.
Has Dr. Gretchen S. Johns received payments from drug or device companies?
CMS Open Payments shows $73 in general payments to Dr. Johns from 2 companies from 2021 to 2023. The largest total came from BioFire Diagnostics, LLC.
How long has Dr. Gretchen S. Johns been practicing?
Dr. Johns graduated from medical school in 1995, 31 years ago.
Does Dr. Gretchen S. Johns do research?
Dmand AI links 13 publications to Dr. Johns, published from 2012 to 2025.
Who does Dr. Gretchen S. Johns publish with?
Dr. Johns' most frequent co-authors are Joseph L. Blackshear, MD (3 shared papers), William D. Freeman, MD (3 shared papers) and Robert Eugene Safford, MD (3 shared papers).
What insurance does Dr. Gretchen S. Johns accept?
Dr. Johns is in network with 4 carriers, including Excellus BlueCross BlueShield, Cigna and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
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