Gastrointest Radiol
EndometriosisIntestinal PerforationSigmoid Diseases
Dr. Gretchen Mary Zimmerman, MD
NPI1609861020
- Medicare services, 2016
- 14
- Part D claims, 2017
- 13
- Publications
- 2
- Industry payments
- $4,686
- Affiliated sites
- 1
- Practice address
- 6550 Fannin St, Houston, TX 77030-2717
- Practice phone
- Call (713) 797-9500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Gretchen M Zimmerman
Multi-specialty group site · Houston, Texas
Find Dr. Zimmerman's professional email, personal email and mobile number
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Dr. Gretchen Mary Zimmerman is a general surgeon in Houston, Texas
Dr. Zimmerman practices at Gretchen M Zimmerman in Houston, Texas.
Dr. Zimmerman's NPI, 1609861020, was assigned on September 12, 2005. Dr. Zimmerman graduated from Drexel University College Of Medicine in 1980. Dr. Zimmerman's Texas license number on file is G2253.
NPI and contact details
- NPI
- 1609861020NPI Registry (opens in a new tab)
- NPI enumeration date
- September 12, 2005
- NPI status
- Active
- Practice phone
- (713) 797-9500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gretchen Mary Zimmerman practices at 2 locations in Houston, Texas
Dr. Zimmerman's primary practice is Gretchen M Zimmerman, at 6550 Fannin St, Houston, TX 77030-2717. The practice phone is (713) 797-9500. The NPI Registry lists Dr. Zimmerman's practice address as 6624 Fannin St, Houston, TX 77030-2341.
- Gretchen M ZimmermanPrimary6550 Fannin St, Houston, TX 77030-2717Phone(713) 797-9500
- NPI Registry address6624 Fannin St, Houston, TX 77030-2341Phone(713) 797-9500
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Gretchen Mary Zimmerman is affiliated with 1 site of care and 1 medical group
Dr. Zimmerman's primary practice is Gretchen M Zimmerman in Houston, Texas. Dmand AI also links Dr. Zimmerman to 1 medical group, named with a free account.
Gretchen M ZimmermanPrimary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Gretchen Mary Zimmerman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zimmerman practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gretchen M Zimmerman | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gretchen Mary Zimmerman is one of 1,939 general surgeons in Texas
Surgery is Dr. Zimmerman's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Zimmerman is board certified in surgery by the American Board of Surgery. Dr. Zimmerman has a license on file in Texas.
Specialties and state licenses
- Surgery, TexasPrimary
General surgeons near Dr. Zimmerman
Counts of general surgeons 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 Mary Zimmerman billed Medicare for 14 services in 2016
CMS data shows 14 Medicare services from Dr. Zimmerman across 1 procedure code in 2016, all of them office visits. Medicare paid $785 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201614
Paid by Medicare$785
Procedure codes1
Dr. Zimmerman compared with the Texas median for general surgeons, 2016
- Dr. Zimmerman
- Texas median
- Medicare services
- 14vs 11888% below
- Part D claims
- 13vs 4269% below
Medians across 1,674 general surgeons in Texas with Dmand AI profiles that report each measure.
Dr. Zimmerman's most billed Medicare procedure codes, 2016
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gretchen Mary Zimmerman wrote 13 Medicare Part D claims in 2017
In 2017, Dr. Zimmerman wrote 13 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $53 in total drug cost. In 2016, CMS named 14 claims across 1 drug.
Part D claims, 201713
Drugs named by CMS1
Total drug cost$53
Dr. Zimmerman's most prescribed drugs by claims, 2017
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, 2016 to 2017
- 2016
- 2017
- Claims for drugs CMS names
- 2016: 142017: 137%
Drugs named by CMS: 1 in 2017, 1 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gretchen Mary Zimmerman has 2 publications on record
Dmand AI links 2 papers to Dr. Zimmerman. The most frequent topics are Intestinal Perforation and Tomography, X-Ray Computed. Dr. Zimmerman's most frequent co-authors are Philip Goodman, MD and Bharat K. Raval, MD.
Papers2
Topics Dr. Zimmerman writes about most
- Intestinal Perforation
- Tomography, X-Ray Computed
Dr. Zimmerman's most frequent co-authors
Recent publications by Dr. Zimmerman
DiverticulumDuodenal DiseasesIntestinal Perforation
See who Dr. Zimmerman researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Zimmerman works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gretchen Mary Zimmerman received $4,686 in industry payments from 2016 to 2018
CMS Open Payments shows 44 general payments to Dr. Zimmerman from 16 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 65% of the total. Novadaq Technologies Inc. paid the most, $2,537.
General payments to Dr. Zimmerman by program year, 2016 to 2018
General payments to Dr. Zimmerman by kind, 2016 to 2018
$4.7Kin total
- Food and beverage$3,06165%
- Travel and lodging$1,62435%
Companies that paid Dr. Zimmerman the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gretchen Mary Zimmerman has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Zimmerman.
Awards and honors for Dr. Zimmerman
- Undated
- ACS Fellow
- Super Doc
Source: Dmand AI Professional Profile Data
Dr. Gretchen Mary Zimmerman graduated from Drexel University College Of Medicine
Dr. Zimmerman graduated from Drexel University College Of Medicine in 1980. Dr. Zimmerman is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Sources for Dr. Gretchen Mary Zimmerman'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 |
| 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 |
| 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 Mary Zimmerman
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 Mary Zimmerman's NPI number?
Dr. Gretchen Mary Zimmerman's NPI number is 1609861020. It was assigned on September 12, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gretchen Mary Zimmerman?
Dr. Gretchen Mary Zimmerman is a general surgeon in Houston, Texas. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gretchen Mary Zimmerman practice?
Dr. Zimmerman practices at 6550 Fannin St, Houston, TX 77030-2717. Dr. Zimmerman also practices at 6624 Fannin St, Houston, TX 77030-2341. Dr. Zimmerman's primary practice is Gretchen M Zimmerman in Houston, Texas. Dmand AI also links Dr. Zimmerman to 1 medical group.
What is Dr. Gretchen Mary Zimmerman's office phone number?
The practice phone on file for Dr. Zimmerman is (713) 797-9500.
What is Dr. Gretchen Mary Zimmerman's medical license number?
Dr. Zimmerman's Texas license number on file is G2253.
Does Dr. Gretchen Mary Zimmerman accept Medicare?
Yes. CMS data shows Dr. Zimmerman billed Medicare for 14 services in 2016.
Is Dr. Gretchen Mary Zimmerman board certified?
Yes. Dr. Zimmerman is board certified in surgery by the American Board of Surgery.
What services does Dr. Gretchen Mary Zimmerman bill to Medicare?
In 2016, Dr. Zimmerman's most billed Medicare services were office visit, new patient (99203).
Where did Dr. Gretchen Mary Zimmerman go to medical school?
Dr. Zimmerman graduated from Drexel University College Of Medicine in 1980.
What drugs does Dr. Gretchen Mary Zimmerman prescribe most?
In 2017 Medicare Part D data, Dr. Zimmerman's most prescribed drugs by claims were Tramadol HCl.
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Has Dr. Gretchen Mary Zimmerman received payments from drug or device companies?
CMS Open Payments shows $4,686 in general payments to Dr. Zimmerman from 16 companies from 2016 to 2018. The largest total came from Novadaq Technologies Inc.
How long has Dr. Gretchen Mary Zimmerman been practicing?
Dr. Zimmerman graduated from medical school in 1980, 46 years ago.
Does Dr. Gretchen Mary Zimmerman do research?
Dmand AI links 2 publications to Dr. Zimmerman.
Who does Dr. Gretchen Mary Zimmerman publish with?
Dr. Zimmerman's most frequent co-authors are Philip Goodman, MD (2 shared papers) and Bharat K. Raval, MD (2 shared papers).
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