Eur J Contracept Reprod Health Care
Contraceptive Agents, FemaleContraceptive Agents, HormonalDepression, Postpartum
Dr. Cassing Hammond, MD
NPI1447260112PAC ID4082658331
- Medicare services, 2024
- 21
- Medicare patients, 2024
- 40
- Part D claims, 2024
- 51
- Publications
- 19
- MIPS score, 2024
- 95
- Practice address
- 675 N St Clair St, Chicago, IL 60611
- Practice phone
- Call (312) 695-0646
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northwestern Medical Group
Chicago, Illinois
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Dr. Cassing Hammond is an OB-GYN in Chicago, Illinois
Dr. Hammond practices at Northwestern Medical Group in Chicago, Illinois.
Dr. Hammond's NPI, 1447260112, was assigned on August 8, 2006. Dr. Hammond graduated from Missouri Medical College in 1988.
NPI and contact details
- NPI
- 1447260112NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082658331
- NPI enumeration date
- August 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 695-0646
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Cassing Hammond practices at Northwestern Medical Group in Chicago, Illinois
Dr. Hammond's primary practice is Northwestern Medical Group, at 675 N St Clair St, Chicago, IL 60611 in Cook County. The practice phone is (312) 695-0646.
- Northwestern Medical Group675 N St Clair St, Chicago, IL 60611 · Cook CountyPhone(312) 695-0646
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Cassing Hammond is affiliated with 3 sites of care and 1 medical group
Dr. Hammond's primary practice is Northwestern Medical Group in Chicago, Illinois. Dr. Hammond is also affiliated with Northwestern Memorial Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Hammond to 1 more group practice or clinic, named with a free account.
Northwestern Medical GroupPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Cassing Hammond's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hammond practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Medical Group | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Cassing Hammond is one of 1,665 OB-GYNs in Illinois
Obstetrics and gynecology is Dr. Hammond's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Hammond has a license on file in Illinois.
Specialties and state licenses
- Obstetrics and gynecology, Illinois
OB-GYNs near Dr. Hammond
Counts of OB-GYNs 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. Cassing Hammond billed Medicare for 21 services in 2024
CMS data shows 21 Medicare services from Dr. Hammond across 1 procedure code in 2024, for 40 Medicare patients. Medicare paid $902 for them. Every service was in an office.
Medicare services, 202421
Medicare patients40
Paid by Medicare$902
Procedure codes1
Dr. Hammond's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 172024: 2124%
Dr. Hammond compared with the Illinois median for OB-GYNs, 2024
- Dr. Hammond
- Illinois median
- Medicare services
- 21vs 4856% below
- Medicare patients
- 40vs 449% below
- Part D claims
- 14vs 2850% below
Medians across 1,360 OB-GYNs in Illinois with Dmand AI profiles that report each measure.
Dr. Hammond's 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hammond and other OB-GYNs in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Cassing Hammond treated 40 Medicare patients in 2024, average age 65
CMS counts 40 Medicare patients who saw Dr. Hammond in 2024. The largest group is 65 to 74, with 19 patients. 70% of them have high cholesterol, and 68% have arthritis. 43% are also on Medicaid. Their average risk score is 1.53, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hammond's median patient age at 38, with 98% women.
Medicare patients, 202440
Average age65
Average risk score1.53
Also on Medicaid43%
Dr. Hammond's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Hammond's Medicare patients, 2024
- High cholesterol70%
- Arthritis68%
- High blood pressure68%
- Anxiety35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hammond's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women98%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Cassing Hammond wrote 51 Medicare Part D claims in 2024
In 2024, Dr. Hammond wrote 51 Medicare Part D claims for 20 patients. 65% of them were for generic drugs. CMS names the drug for 14 of them, across 1 drug with 11 or more claims each, at $1,409 in total drug cost. In 2022, CMS named 13 claims across 1 drug.
Part D claims, 202451
Drugs named by CMS1
Total drug cost$1,409
Part D patients20
Dr. Hammond's Part D claims by kind of drug, 2024
- Generic33 claims65%
- Brand-name18 claims35%
Dr. Hammond's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 132023: 148%
Drugs named by CMS: 1 in 2023, 1 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Cassing Hammond scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Hammond for performance year 2024, reported through an alternative payment model (APM). Dr. Hammond accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Hammond's MIPS scores, performance year 2024
- 95of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Cassing Hammond has 19 publications on record
Dmand AI links 19 papers to Dr. Hammond, published from 2012 to 2020. 2012 was the busiest year, with 3. The most frequent topics are Contraception, Abortion, Induced and Pregnancy Trimester, Second. Dr. Hammond has published most often in Contraception. Dr. Hammond's most frequent co-authors are Lori Marie Gawron, MD, Melissa Joy Chen, MD, MPH and Sheila Mody, MD.
Papers19
Years published2012 to 2020
Dr. Hammond's papers by year, 2012 to 2020
Topics Dr. Hammond writes about most
- Contraception
- Abortion, Induced
- Pregnancy Trimester, Second
- Family Planning Services
- Inflammatory Bowel Diseases
- Clinical Competence
- Contraceptive Agents
- Contraceptive Agents, Female
Dr. Hammond's most frequent co-authors
- Lori Marie Gawron, MD7 shared papers
- Melissa Joy Chen, MD, MPH2 shared papers
- Sheila Mody, MD2 shared papers
Recent publications by Dr. Hammond
Abortion, InducedAnti-HIV AgentsHealth Knowledge, Attitudes, Practice
ContraceptionContraceptive Agents, FemaleDesogestrel
Semin Reprod Med
ContraceptionCounselingFamily Planning Services
Contraception
Abortion, InducedClinical CompetenceCurriculum
See who Dr. Hammond researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hammond works with, so you can find a warm path to the right OB-GYNs.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Cassing Hammond received $3,610 in industry payments from 2016 to 2022
CMS Open Payments shows 17 general payments to Dr. Hammond from 3 drug and device companies from 2016 to 2022. Consulting fees make up the largest share, 90% of the total. Medicines360 paid the most, $3,378.
General payments to Dr. Hammond by program year, 2016 to 2022
General payments to Dr. Hammond by kind, 2016 to 2022
$3.6Kin total
- Consulting fees$3,25090%
- Food and beverage$36010%
Companies that paid Dr. Hammond the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Cassing Hammond graduated from Missouri Medical College
Dr. Hammond graduated from Missouri Medical College in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Cassing Hammond'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 |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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)Clinician Public Reporting: Overall MIPS Performance (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) |
| 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. Cassing Hammond
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. Cassing Hammond's NPI number?
Dr. Cassing Hammond's NPI number is 1447260112. It was assigned on August 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Cassing Hammond?
Dr. Cassing Hammond is an OB-GYN in Chicago, Illinois. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Cassing Hammond practice?
Dr. Hammond practices at 675 N St Clair St, Chicago, IL 60611. Dr. Hammond's primary practice is Northwestern Medical Group in Chicago, Illinois. Dmand AI also links Dr. Hammond to 1 group practice or clinic.
What is Dr. Cassing Hammond's office phone number?
The practice phone on file for Dr. Hammond is (312) 695-0646.
Which hospitals is Dr. Cassing Hammond affiliated with?
Dr. Hammond is affiliated with Northwestern Memorial Hospital.
What medical group is Dr. Cassing Hammond part of?
Dr. Hammond is linked to Northwestern Medical Faculty Foundation.
Does Dr. Cassing Hammond accept Medicare?
Yes. CMS data shows Dr. Hammond billed Medicare for 21 services in 2024, and Dr. Hammond accepts Medicare assignment.
What is Dr. Cassing Hammond's MIPS score?
Dr. Hammond's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Cassing Hammond see?
CMS counts 40 Medicare patients who saw Dr. Hammond in 2024, with an average age of 65.
What services does Dr. Cassing Hammond bill to Medicare?
In 2024, Dr. Hammond's most billed Medicare services were medicare service (G0101).
Show 6 more questionsShow fewer questions
Where did Dr. Cassing Hammond go to medical school?
Dr. Hammond graduated from Missouri Medical College in 1988.
What drugs does Dr. Cassing Hammond prescribe most?
In 2023 Medicare Part D data, Dr. Hammond's most prescribed drugs by claims were Estradiol.
Has Dr. Cassing Hammond received payments from drug or device companies?
CMS Open Payments shows $3,610 in general payments to Dr. Hammond from 3 companies from 2016 to 2022. The largest total came from Medicines360.
How long has Dr. Cassing Hammond been practicing?
Dr. Hammond graduated from medical school in 1988, 38 years ago.
Does Dr. Cassing Hammond do research?
Dmand AI links 19 publications to Dr. Hammond, published from 2012 to 2020.
Who does Dr. Cassing Hammond publish with?
Dr. Hammond's most frequent co-authors are Lori Marie Gawron, MD (7 shared papers), Melissa Joy Chen, MD, MPH (2 shared papers) and Sheila Mody, MD (2 shared papers).
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