Gregory Matthew Lessans, M.D.
Anesthesiology Physician · Houston, TX
Gregory Matthew Lessans, M.D. is an anesthesiology physician with a practice address in Houston, Texas, and NPI 1699154971, issued on May 20, 2015. Check the license (Texas S5004, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Matthew Lessans
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- S5004 TX
Self-reported in NPPES; status is on the state search - Practice location
- 6621 Fannin St, Houston, TX 77030
- Phone
- (203) 785-2802
- Enumerated
- May 20, 2015
- Record last updated
- Mar 13, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20230221000577); accepts Medicare assignment
- Medical or professional school
- University Of Maryland School Of Medicine, 2015
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 4,635 in Texas → Look up another NPI →
Also registered at 6621 Fannin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Matthew Lessans in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license S5004Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $21.28
1 payment: food and beverage; the largest payer was Vertex Pharmaceuticals Incorporated. The 17,774 providers of this specialty with any payment received $669.59 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Anesthesia Company LLCAnnapolis, MD
- Gbmc Hospital Based Services LLCBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Matthew Lessans among 4,635 anesthesiology physician records in Texas
Gregory Matthew Lessans, M.D. is one of 4,635 anesthesiology physician records with a practice address in Texas. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 81% of them.
- NPI issued2015 · 81% of these records are older, 17% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2015 · median 2005 among the 3,293 with a school on file
- Record last updated2020 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,130 anesthesiology physician records list a practice address in Houston
They are 1,130 of the 61,221 NPPES records with a practice address in Houston, and 4,635 anesthesiology physician records in Texas.
All 4,635 in Texas → Every provider in Houston → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Melanie Alo, M.D.Houston, TX 770301689671240
- Dean Andropoulos, M.D.Houston, TX 770301366449779
- James Anton, M.D.Houston, TX 770301134129992
- Liqian Chen, M.D.Houston, TX 770301548260011
- Charles Collard, M.D.Houston, TX 770301548260151
- Camille Colomb, M.D.Houston, TX 770301790782118
- John Cooper, M.D.Houston, TX 770301861492324
- Noel Giesecke, MDHouston, TX 770301720088263
Common questions
What is Gregory Matthew Lessans, M.D.'s NPI number?
Gregory Matthew Lessans, M.D.'s National Provider Identifier (NPI) is 1699154971, issued on May 20, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Matthew Lessans, M.D. located?
The NPPES record lists a practice address at 6621 Fannin St, Houston, TX, 77030. Phone: (203) 785-2802. Providers update this record themselves, so call before visiting.
How can I verify Gregory Matthew Lessans, M.D.'s license?
NPPES lists Texas license number S5004, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.