Karissa C. Hammer, M.D.
Obstetrics & Gynecology Physician · Chicago, IL
Karissa C. Hammer, M.D. is an obstetrics & gynecology physician with a practice address in Chicago, Illinois, and NPI 1801277736, issued on Jun 16, 2015. Check the license (Illinois 125067366, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Karissa C. Hammer
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- 125067366 IL
278746 MA
Self-reported in NPPES; status is on the state search - Practice location
- 680 N Lake Shore Dr, Chicago, IL 60611
- Phone
- (312) 288-6420
- Enumerated
- Jun 16, 2015
- Record last updated
- Jul 25, 2025
- Fax
- (312) 288-6421
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 2,062 in Illinois → Look up another NPI →
Also registered at 680 N Lake Shore Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karissa C. Hammer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 125067366Check 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: $22.81
1 payment: food and beverage; the largest payer was Hologic Sales and Service, LLC. The 21,429 providers of this specialty with any payment received $1,030.61 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.
Karissa C. Hammer among 2,062 obstetrics & gynecology physician records in Illinois
Karissa C. Hammer, M.D. is one of 2,062 obstetrics & gynecology physician records with a practice address in Illinois. 72% 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 72% of them.
- NPI issued2015 · 72% of these records are older, 26% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2025 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
700 obstetrics & gynecology physician records list a practice address in Chicago
They are 700 of the 63,379 NPPES records with a practice address in Chicago, and 2,062 obstetrics & gynecology physician records in Illinois.
All 2,062 in Illinois → Every provider in Chicago → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Angela Chaudhari, M.D.Chicago, IL 606111275596959
- April Dewhite, M.D.Chicago, IL 606111265415848
- Julie Ericson, M.D.Chicago, IL 606111588628754
- Patricia Gale, MDChicago, IL 606111437119229
- Micah Garb, M.D.Chicago, IL 606111225012362
- Parul Gupta, M.D.Chicago, IL 606111023001187
- Elena Kamel, M.D.Chicago, IL 606111790749463
- Julie Levitt, M.D.Chicago, IL 606111215991807
Common questions
What is Karissa C. Hammer, M.D.'s NPI number?
Karissa C. Hammer, M.D.'s National Provider Identifier (NPI) is 1801277736, issued on Jun 16, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Karissa C. Hammer, M.D. located?
The NPPES record lists a practice address at 680 N Lake Shore Dr, Chicago, IL, 60611. Phone: (312) 288-6420. Providers update this record themselves, so call before visiting.
How can I verify Karissa C. Hammer, M.D.'s license?
NPPES lists Illinois license number 125067366, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. 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.