Dr. John Barthelow Classen, MD
- Medicare services, 2022
- 256
- Part D claims, 2022
- 13
- Publications
- 8
- Insurance carriers
- 1
- State licenses
- 6
- Practice address
- 2722 Concord Pike, Wilmington, DE 19803
- Practice phone
- Call (410) 956-3394
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Classen'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 Barthelow Classen is a general practice physician in Wilmington, Delaware
Dr. Classen practices in Wilmington, Delaware.
Dr. Classen's NPI, 1215037676, was assigned on September 25, 2006. Dr. Classen graduated from University of Maryland School of Medicine - Baltimore in 1988. Dr. Classen holds Maryland license D0052684.
- NPI
- 1215037676NPI Registry (opens in a new tab)
- NPI enumeration date
- September 25, 2006
- NPI status
- Active
- Practice phone
- (410) 956-3394
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. John Barthelow Classen's practice address is in Wilmington, Delaware
Dr. Classen's practice address in the NPI Registry is 2722 Concord Pike, Wilmington, DE 19803, in New Castle County. The practice phone is (410) 956-3394.
- NPI Registry address2722 Concord Pike, Wilmington, DE 19803 · New Castle CountyPhone(410) 956-3394
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. John Barthelow Classen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Classen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Classen's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Barthelow Classen is one of 35 general practice physicians in Delaware
General practice is Dr. Classen's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dmand AI has Dr. Classen's licenses on file in 6 states: Maryland, Delaware, District of Columbia, Virginia, West Virginia and Pennsylvania.
Specialties and state licenses
- General practice, MarylandPrimary
- Delaware license
- District of Columbia license
- Virginia license
- West Virginia license
- Pennsylvania license
General practice physicians near Dr. Classen
Counts of general practice 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 Barthelow Classen billed Medicare for 256 services in 2022
CMS data shows 256 Medicare services from Dr. Classen across 6 procedure codes in 2022. Medicare paid $15,014 for them. Every service was in an office.
Dr. Classen's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Lab and pathology
- 2021: 1472022: 1587%
- Office and hospital visits
- 2021: 972022: 981%
Dr. Classen compared with the Delaware median for general practice physicians, 2022
- Dr. Classen
- Delaware median
- Part D claims
- 13vs 8585% below
Medians across 13 general practice physicians in Delaware with Dmand AI profiles that report each measure.
Dr. Classen's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Classen and other general practice physicians in Delaware.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Barthelow Classen's patients have a median age of 39
Across all payers, Dmand AI patient panel data puts Dr. Classen's median patient age at 39, with 42% women.
Dr. Classen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 39
Patient panel by sex, all payers
- Women42%
- Men57%
Source: Dmand AI Patient Panel Data
Dr. John Barthelow Classen wrote 13 Medicare Part D claims in 2022
In 2022, Dr. Classen wrote 13 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $89 in total drug cost. In 2017, CMS named 14 claims across 1 drug.
Dr. Classen's most prescribed drugs by claims, 2022
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, 2017 to 2022
- 2017
- 2022
- Claims for drugs CMS names
- 2017: 142022: 137%
Drugs named by CMS: 1 in 2022, 1 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. John Barthelow Classen has 8 publications on record
Dmand AI links 8 papers to Dr. Classen, published from 2019 to 2024. 2022 was the busiest year, with 3. Dr. Classen has published most often in Animals (Basel).
Dr. Classen's papers by year, 2019 to 2024
Recent publications by Dr. Classen
J Environ Manage
Environ Sci Pollut Res Int
See who Dr. Classen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Classen works with, so you can find a warm path to the right general practice physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John Barthelow Classen graduated from University of Maryland School of Medicine - Baltimore
Dr. Classen graduated from University of Maryland School of Medicine - Baltimore in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. John Barthelow Classen accepts plans from 1 insurance carrier
Dr. Classen is in network with 1 carrier, including DE State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
- DE State Medicaid
Source: Dmand AI Insurance Network Data
Sources for Dr. John Barthelow Classen'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 |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Barthelow Classen
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 Barthelow Classen's NPI number?
Dr. John Barthelow Classen's NPI number is 1215037676. It was assigned on September 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Barthelow Classen?
Dr. John Barthelow Classen is a general practice physician in Wilmington, Delaware. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. John Barthelow Classen practice?
Dr. Classen practices at 2722 Concord Pike, Wilmington, DE 19803.
What is Dr. John Barthelow Classen's office phone number?
The practice phone on file for Dr. Classen is (410) 956-3394.
What is Dr. John Barthelow Classen's medical license number?
Dr. Classen holds Maryland license D0052684, one of the licenses on file in 6 states.
Which states has Dr. John Barthelow Classen been licensed in?
Dmand AI has state licenses on file for Dr. Classen in Maryland (1997 to 2026), Delaware (1997 to 2027), District of Columbia (1997 to 2026), Virginia (1997 to 2026), West Virginia (1997 to 2026) and Pennsylvania (2020 to 2022).
Does Dr. John Barthelow Classen accept Medicare?
Yes. CMS data shows Dr. Classen billed Medicare for 256 services in 2022.
What services does Dr. John Barthelow Classen bill to Medicare?
In 2022, Dr. Classen's most billed Medicare services were lab and pathology test (87811), office visit, established patient (99214) and lab and pathology test (87804).
Where did Dr. John Barthelow Classen go to medical school?
Dr. Classen graduated from University of Maryland School of Medicine - Baltimore in 1988.
What drugs does Dr. John Barthelow Classen prescribe most?
In 2022 Medicare Part D data, Dr. Classen's most prescribed drugs by claims were Amoxicillin.
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How long has Dr. John Barthelow Classen been practicing?
Dr. Classen graduated from medical school in 1988, 38 years ago.
Does Dr. John Barthelow Classen do research?
Dmand AI links 8 publications to Dr. Classen, published from 2019 to 2024.
What insurance does Dr. John Barthelow Classen accept?
Dr. Classen is in network with 1 carrier, including DE State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
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