Dr. Cathy E. Nieman, MD
- Medicare services, 2024
- 2,318
- Medicare patients, 2024
- 593
- Part D claims, 2024
- 10,251
- MIPS score, 2024
- 91
- Hospital affiliations
- 5
- Practice address
- 1815 W 6th Ave, Stillwater, OK 74074
- Practice phone
- Call (405) 372-1480
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Stillwater Medical Center Authority
Stillwater, Oklahoma
Find Dr. Nieman's professional email, personal email and mobile number
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Dr. Cathy E. Nieman is an internist in Stillwater, Oklahoma
Dr. Nieman practices at Stillwater Medical Center Authority in Stillwater, Oklahoma.
Dr. Nieman's NPI, 1578556171, was assigned on August 30, 2005. Dr. Nieman graduated from University of Oklahoma College of Medicine in 1996. Dr. Nieman holds Oklahoma license 20253.
- NPI
- 1578556171NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840296620
- NPI enumeration date
- August 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (405) 372-1480
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Cathy E. Nieman practices at Stillwater Medical Center Authority in Stillwater, Oklahoma
Dr. Nieman's primary practice is Stillwater Medical Center Authority, at 1815 W 6th Ave, Stillwater, OK 74074 in Payne County. The practice phone is (405) 372-1480.
- Stillwater Medical Center Authority1815 W 6th Ave, Stillwater, OK 74074 · Payne CountyPhone(405) 372-1480
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Cathy E. Nieman is affiliated with 12 sites of care and 1 medical group
Dr. Nieman's primary practice is Stillwater Medical Center Authority in Stillwater, Oklahoma. Dr. Nieman is also affiliated with Stillwater Medical Center. The medical group on file is Stillwater Medical Center. Dmand AI also links Dr. Nieman to 4 more hospitals, 4 home health agencies, 1 physician office and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Cathy E. Nieman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nieman practices, 11 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stillwater Medical Center Authority | Available with a free account |
| +11 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Cathy E. Nieman is one of 1,018 internists in Oklahoma
Internal medicine is Dr. Nieman's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Nieman is licensed in Oklahoma.
Specialties and state licenses
- Internal medicine, OklahomaPrimary
Internists near Dr. Nieman
Counts of internists 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. Cathy E. Nieman billed Medicare for 2,318 services in 2024
CMS data shows 2,318 Medicare services from Dr. Nieman across 22 procedure codes in 2024, for 593 Medicare patients. Medicare paid $154,813 for them.
Dr. Nieman's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4122024: 1,21814%
- Tests and treatments
- 2023: 4362024: 50115%
- Other services
- 2023: 5992024: 44626%
- Drugs given in the office
- 2023: 392024: 7797%
- Imaging
- 2023: 592024: 637%
- Lab and pathology
- 2023: 02024: 13
- Surgery
- 2023: 692024: 0100%
Where Dr. Nieman's Medicare services took place, 2024
- In an office2,04988%
- In a facility26912%
Dr. Nieman compared with the Oklahoma median for internists, 2024
- Dr. Nieman
- Oklahoma median
- Medicare services
- 2,318vs 6363.6 times
- Medicare patients
- 593vs 2432.4 times
- Part D claims
- 9,536vs 28233.8 times
Medians across 969 internists in Oklahoma with Dmand AI profiles that report each measure.
Dr. Nieman'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.
Need commercial claims for Dr. Nieman?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nieman and other internists in Oklahoma.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Cathy E. Nieman treated 593 Medicare patients in 2024, average age 74
CMS counts 593 Medicare patients who saw Dr. Nieman in 2024. The largest group is 75 to 84, with 224 patients. 74% of them have high blood pressure, and 61% have high cholesterol. 15% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nieman's median patient age at 64, with 70% women.
Dr. Nieman's Medicare patients by age, 2024
Dr. Nieman's Medicare patients by sex, 2024
- Women42271%
- Men17129%
Chronic conditions among Dr. Nieman's Medicare patients, 2024
- High blood pressure74%
- High cholesterol61%
- Arthritis54%
- Diabetes36%
- Mood disorders35%
- Depression33%
- Ischemic heart disease25%
- Anxiety21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nieman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women70%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Cathy E. Nieman wrote 10,251 Medicare Part D claims in 2024
In 2024, Dr. Nieman wrote 10,251 Medicare Part D claims for 438 patients. 86% of them were for generic drugs. CMS names the drug for 9,536 of them, across 151 drugs with 11 or more claims each, at $738,260 in total drug cost. In 2023, CMS named 8,924 claims across 149 drugs.
Dr. Nieman's Part D claims by kind of drug, 2024
- Generic8,841 claims86%
- Brand-name1,365 claims13%
- Other45 claims0%
Dr. Nieman's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nieman's Part D claims, 2024
- Opioids1%113 of 10,251 claims
- Antibiotics1%97 of 10,251 claims
- Antipsychotics, patients 65 and over1%107 of 10,251 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8,9242024: 9,5367%
Drugs named by CMS: 151 in 2024, 149 in 2023.
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. Cathy E. Nieman scored 91 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 91 out of 100 for Dr. Nieman for performance year 2024, reported through an alternative payment model (APM). Dr. Nieman accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Nieman's MIPS scores, performance year 2024
- 91of 100Final score
- 76.5of 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. Cathy E. Nieman received $398 in industry payments from 2016 to 2025
CMS Open Payments shows 22 general payments to Dr. Nieman from 12 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $94.
General payments to Dr. Nieman by program year, 2016 to 2025
Companies that paid Dr. Nieman the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Cathy E. Nieman graduated from University of Oklahoma College of Medicine
Dr. Nieman graduated from University of Oklahoma College of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Cathy E. Nieman'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) |
| 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. Cathy E. Nieman
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. Cathy E. Nieman's NPI number?
Dr. Cathy E. Nieman's NPI number is 1578556171. It was assigned on August 30, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Cathy E. Nieman?
Dr. Cathy E. Nieman is an internist in Stillwater, Oklahoma. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Cathy E. Nieman practice?
Dr. Nieman practices at 1815 W 6th Ave, Stillwater, OK 74074. Dr. Nieman's primary practice is Stillwater Medical Center Authority in Stillwater, Oklahoma. Dmand AI also links Dr. Nieman to 4 hospitals, 4 home health agencies, 1 physician office and 1 group practice or clinic.
What is Dr. Cathy E. Nieman's office phone number?
The practice phone on file for Dr. Nieman is (405) 372-1480.
What is Dr. Cathy E. Nieman's medical license number?
Dr. Nieman holds Oklahoma license 20253.
Which hospitals is Dr. Cathy E. Nieman affiliated with?
Dr. Nieman is affiliated with Stillwater Medical Center. Dmand AI links Dr. Nieman to 4 more hospitals.
What medical group is Dr. Cathy E. Nieman part of?
Dr. Nieman is linked to Stillwater Medical Center.
Does Dr. Cathy E. Nieman accept Medicare?
Yes. CMS data shows Dr. Nieman billed Medicare for 2,318 services in 2024, and Dr. Nieman accepts Medicare assignment.
What is Dr. Cathy E. Nieman's MIPS score?
Dr. Nieman's MIPS final score for performance year 2024 is 91 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Cathy E. Nieman see?
CMS counts 593 Medicare patients who saw Dr. Nieman in 2024, with an average age of 74.
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What services does Dr. Cathy E. Nieman bill to Medicare?
In 2024, Dr. Nieman's most billed Medicare services were office visit, established patient (99214), heart test or procedure (93010) and medicare service (G0439).
Where did Dr. Cathy E. Nieman go to medical school?
Dr. Nieman graduated from University of Oklahoma College of Medicine in 1996.
What drugs does Dr. Cathy E. Nieman prescribe most?
In 2024 Medicare Part D data, Dr. Nieman's most prescribed drugs by claims were Levothyroxine Sodium, Atorvastatin Calcium and Gabapentin.
Has Dr. Cathy E. Nieman received payments from drug or device companies?
CMS Open Payments shows $398 in general payments to Dr. Nieman from 12 companies from 2016 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Cathy E. Nieman been practicing?
Dr. Nieman graduated from medical school in 1996, 30 years ago.
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