Dr. Gregory Matthew Lessans, MD
- Medicare services, 2024
- 44
- Medicare patients, 2024
- 142
- Hospital affiliations
- 1
- Industry payments
- $21
- Medical groups
- 2
- Practice address
- 6701 North Charles Street, Baltimore, MD 21204
- Practice phone
- Call (443) 849-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Gregory Matthew Lessans is an anesthesiologist in Towson, Maryland
Dr. Lessans practices at Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare.
Dr. Lessans' NPI, 1699154971, was assigned on May 20, 2015. Dr. Lessans graduated from University of Maryland School of Medicine in 2015. Dr. Lessans holds Texas license S5004.
- NPI
- 1699154971NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6709191315
- NPI enumeration date
- May 20, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (443) 849-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Matthew Lessans practices at Greater Baltimore Medical Center in Baltimore, Maryland
Dr. Lessans' primary practice is Greater Baltimore Medical Center, at 6701 North Charles Street, Baltimore, MD 21204 in Baltimore County. The practice phone is (443) 849-2000.
- Greater Baltimore Medical Center6701 North Charles Street, Baltimore, MD 21204 · Baltimore CountyPhone(443) 849-2000
Source: Dmand AI Affiliation Data
Dr. Gregory Matthew Lessans is affiliated with 1 site of care and 2 medical groups
Dr. Lessans' primary practice is Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare. The medical group on file is Anesthesia Company, LLC. Dmand AI also links Dr. Lessans to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory Matthew Lessans' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lessans practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Greater Baltimore Medical Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory Matthew Lessans is one of 965 anesthesiologists in Maryland
Anesthesiology is Dr. Lessans' primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Lessans is licensed in Texas.
Specialties and state licenses
- Anesthesiology, TexasPrimary
Anesthesiologists near Dr. Lessans
Counts of anesthesiologists 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. Gregory Matthew Lessans billed Medicare for 44 services in 2024
CMS data shows 44 Medicare services from Dr. Lessans across 3 procedure codes in 2024, for 142 Medicare patients. Medicare paid $4,124 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Lessans' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 302024: 4447%
Dr. Lessans compared with the Maryland median for anesthesiologists, 2024
- Dr. Lessans
- Maryland median
- Medicare services
- 44vs 10156% below
- Medicare patients
- 142vs 17619% below
Medians across 918 anesthesiologists in Maryland with Dmand AI profiles that report each measure.
Dr. Lessans' 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. Lessans?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lessans and other anesthesiologists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Matthew Lessans treated 142 Medicare patients in 2024, average age 74
CMS counts 142 Medicare patients who saw Dr. Lessans in 2024. The largest group is 65 to 74, with 70 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.20, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lessans' median patient age at 45, with 64% women.
Dr. Lessans' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lessans' Medicare patients by sex, 2024
- Women7251%
- Men7049%
Chronic conditions among Dr. Lessans' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis51%
- Diabetes35%
- Anxiety32%
- Ischemic heart disease32%
- Mood disorders30%
- Depression27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lessans' 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
- Women64%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Gregory Matthew Lessans takes part in Medicare
Dr. Lessans accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory Matthew Lessans received $21 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. Lessans from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Vertex Pharmaceuticals Incorporated paid the most, $21.
Companies that paid Dr. Lessans the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Matthew Lessans graduated from University of Maryland School of Medicine
Dr. Lessans graduated from University of Maryland School of Medicine in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Matthew Lessans'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) |
| 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. Gregory Matthew Lessans
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 Matthew Lessans' NPI number?
Dr. Gregory Matthew Lessans' NPI number is 1699154971. It was assigned on May 20, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Matthew Lessans?
Dr. Gregory Matthew Lessans is an anesthesiologist in Towson, Maryland. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Gregory Matthew Lessans practice?
Dr. Lessans practices at 6701 North Charles Street, Baltimore, MD 21204. Dr. Lessans' primary practice is Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare. Dmand AI also links Dr. Lessans to 1 medical group.
What is Dr. Gregory Matthew Lessans' office phone number?
The practice phone on file for Dr. Lessans is (443) 849-2000.
What is Dr. Gregory Matthew Lessans' medical license number?
Dr. Lessans holds Texas license S5004.
Which hospitals is Dr. Gregory Matthew Lessans affiliated with?
Dr. Lessans practices at Greater Baltimore Medical Center in Baltimore, Maryland.
What medical group is Dr. Gregory Matthew Lessans part of?
Dr. Lessans is linked to Anesthesia Company, LLC. Dmand AI links Dr. Lessans to 1 more medical group.
Does Dr. Gregory Matthew Lessans accept Medicare?
Yes. CMS data shows Dr. Lessans billed Medicare for 44 services in 2024, and Dr. Lessans accepts Medicare assignment.
How many Medicare patients does Dr. Gregory Matthew Lessans see?
CMS counts 142 Medicare patients who saw Dr. Lessans in 2024, with an average age of 74.
What services does Dr. Gregory Matthew Lessans bill to Medicare?
In 2024, Dr. Lessans' most billed Medicare services were anesthesia (00140), anesthesia (00811) and anesthesia (00142).
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Where did Dr. Gregory Matthew Lessans go to medical school?
Dr. Lessans graduated from University of Maryland School of Medicine in 2015.
Has Dr. Gregory Matthew Lessans received payments from drug or device companies?
CMS Open Payments shows $21 in general payments to Dr. Lessans from 1 company from 2024 to 2024. The largest total came from Vertex Pharmaceuticals Incorporated.
How long has Dr. Gregory Matthew Lessans been practicing?
Dr. Lessans graduated from medical school in 2015, 11 years ago.
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