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Dr. Gregory John Diehl, MD
NPI1447249214
- Medicare services, 2021
- 550
- Part D claims, 2021
- 194
- Publications
- 1
- Industry payments
- $124
- Insurance carriers
- 1
- Practice address
- 1500 Route 112 Bldg # 10, Port Jefferson Station, NY 11776
- Practice phone
- Call (631) 476-7300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Diehl's professional email, personal email and mobile number
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Dr. Gregory John Diehl is a plastic surgeon in Port Jefferson Station, New York
Dr. Diehl practices in Port Jefferson Station, New York.
Dr. Diehl's NPI, 1447249214, was assigned on October 14, 2005. Dr. Diehl graduated from WashU Medicine in 1986. Dr. Diehl holds New York license 1902162.
NPI and contact details
- NPI
- 1447249214NPI Registry (opens in a new tab)
- NPI enumeration date
- October 14, 2005
- NPI status
- Active
- Practice phone
- (631) 476-7300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Gregory John Diehl's practice address is in Port Jefferson Station, New York
Dr. Diehl's practice address in the NPI Registry is 1500 Route 112 Bldg # 10, Port Jefferson Station, NY 11776. The practice phone is (631) 476-7300.
- NPI Registry address1500 Route 112 Bldg # 10, Port Jefferson Station, NY 11776Phone(631) 476-7300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Gregory John Diehl's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diehl practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Diehl's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory John Diehl is one of 357 plastic surgeons in New York
Plastic surgery is Dr. Diehl's primary specialty in the NPI Registry, under taxonomy code 208200000X. Dr. Diehl is board certified in plastic surgery by the American Board of Plastic Surgery. Dr. Diehl is licensed in New York.
Specialties and state licenses
- Plastic surgery, New YorkPrimary
Plastic surgeons near Dr. Diehl
Counts of plastic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
357plastic surgeons in New York
2plastic surgeons in Port Jefferson Station
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory John Diehl billed Medicare for 550 services in 2021
CMS data shows 550 Medicare services from Dr. Diehl across 13 procedure codes in 2021. Medicare paid $188,621 for them. Every service was in an office.
Medicare services, 2021550
Paid by Medicare$188,621
Procedure codes13
Dr. Diehl's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Surgery
- 2020: 2122021: 28836%
- Office and hospital visits
- 2020: 2282021: 26215%
Dr. Diehl compared with the New York median for plastic surgeons, 2021
- Dr. Diehl
- New York median
- Medicare services
- 550vs 698.0 times
- Part D claims
- 194vs 1910.2 times
Medians across 309 plastic surgeons in New York with Dmand AI profiles that report each measure.
Dr. Diehl's most billed Medicare procedure codes, 2021
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. Diehl and other plastic surgeons in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory John Diehl's patients have a median age of 45
Across all payers, Dmand AI patient panel data puts Dr. Diehl's median patient age at 45, with 75% women.
Dr. Diehl's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women75%
- Men25%
Source: Dmand AI Patient Panel Data
Dr. Gregory John Diehl wrote 194 Medicare Part D claims in 2021
In 2021, Dr. Diehl wrote 194 Medicare Part D claims. They cover 4 drugs, with $683 in total drug cost. In 2020, CMS named 140 claims across 3 drugs.
Part D claims, 2021194
Drugs named by CMS4
Total drug cost$683
Dr. Diehl's most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 1402021: 19439%
Drugs named by CMS: 4 in 2021, 3 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gregory John Diehl has 1 publication on record
Dmand AI links 1 paper to Dr. Diehl. Dr. Diehl's most frequent co-author is Roger K. Khouri, MD.
Papers1
Dr. Diehl's most frequent co-authors
- Roger K. Khouri, MD1 shared paper
Recent publications by Dr. Diehl
See who Dr. Diehl researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Diehl works with, so you can find a warm path to the right plastic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory John Diehl received $124 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Diehl from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Acell, Inc. paid the most, $124.
Companies that paid Dr. Diehl the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory John Diehl has 1 award and honors on record
Dmand AI lists 1 award for Dr. Diehl.
Awards and honors for Dr. Diehl
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Gregory John Diehl graduated from WashU Medicine
Dr. Diehl graduated from WashU Medicine in 1986. Dr. Diehl is a member of ACS and ASPS.
- Medical school
- Board certified in plastic surgery
Source: Dmand AI Professional Profile Data
Dr. Gregory John Diehl accepts plans from 1 insurance carrier
Dr. Diehl is in network with 1 carrier, including NY State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
- NY State Medicaid
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory John Diehl'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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Gregory John Diehl
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. Gregory John Diehl's NPI number?
Dr. Gregory John Diehl's NPI number is 1447249214. It was assigned on October 14, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory John Diehl?
Dr. Gregory John Diehl is a plastic surgeon in Port Jefferson Station, New York. The primary specialty in the NPI Registry is Plastic Surgery Physician (taxonomy code 208200000X).
Where does Dr. Gregory John Diehl practice?
Dr. Diehl practices at 1500 Route 112 Bldg # 10, Port Jefferson Station, NY 11776.
What is Dr. Gregory John Diehl's office phone number?
The practice phone on file for Dr. Diehl is (631) 476-7300.
What is Dr. Gregory John Diehl's medical license number?
Dr. Diehl holds New York license 1902162.
Does Dr. Gregory John Diehl accept Medicare?
Yes. CMS data shows Dr. Diehl billed Medicare for 550 services in 2021.
Is Dr. Gregory John Diehl board certified?
Yes. Dr. Diehl is board certified in plastic surgery by the American Board of Plastic Surgery.
What services does Dr. Gregory John Diehl bill to Medicare?
In 2021, Dr. Diehl's most billed Medicare services were surgery: skin and soft tissue (15004), office visit, established patient (99213) and office visit, new patient (99205).
Where did Dr. Gregory John Diehl go to medical school?
Dr. Diehl graduated from WashU Medicine in 1986.
What drugs does Dr. Gregory John Diehl prescribe most?
In 2021 Medicare Part D data, Dr. Diehl's most prescribed drugs by claims were Cephalexin, Clindamycin HCl and Hydrocodone-Acetaminophen.
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Has Dr. Gregory John Diehl received payments from drug or device companies?
CMS Open Payments shows $124 in general payments to Dr. Diehl from 1 company from 2017 to 2017. The largest total came from Acell, Inc.
How long has Dr. Gregory John Diehl been practicing?
Dr. Diehl graduated from medical school in 1986, 40 years ago.
Does Dr. Gregory John Diehl do research?
Dmand AI links 1 publication to Dr. Diehl.
Who does Dr. Gregory John Diehl publish with?
Dr. Diehl's most frequent co-authors are Roger K. Khouri, MD (1 shared paper).
What insurance does Dr. Gregory John Diehl accept?
Dr. Diehl is in network with 1 carrier, including NY State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
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