Dr. William Joseph Nienaber, MD
- Medicare services, 2024
- 5,202
- Medicare patients, 2024
- 3,266
- Part D claims, 2024
- 3,208
- Hospital affiliations
- 5
- Industry payments
- $842
- Practice address
- 211 St Francis Dr, Cape Girardeau, MO 63703
- Practice phone
- Call (573) 331-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nienaber's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William Joseph Nienaber is a cardiologist in Cape Girardeau, Missouri
Dr. Nienaber practices at Saint Francis Medical Center in Cape Girardeau, Missouri, part of Saint Francis Healthcare System.
Dr. Nienaber's NPI, 1720296940, was assigned on May 20, 2007. Dr. Nienaber graduated from Creighton University School of Medicine in 2005. Dr. Nienaber holds Missouri license 2007033628.
- NPI
- 1720296940NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2264507854
- NPI enumeration date
- May 20, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (573) 331-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Joseph Nienaber practices at Saint Francis Medical Center in Cape Girardeau, Missouri
Dr. Nienaber's primary practice is Saint Francis Medical Center, at 211 St Francis Dr, Cape Girardeau, MO 63703 in Cape Girardeau County. The practice phone is (573) 331-3000.
- Saint Francis Medical Center211 St Francis Dr, Cape Girardeau, MO 63703 · Cape Girardeau CountyPhone(573) 331-3000
Source: Dmand AI Affiliation Data
Dr. William Joseph Nienaber is affiliated with 6 sites of care and 3 medical groups
Dr. Nienaber's primary practice is Saint Francis Medical Center in Cape Girardeau, Missouri, part of Saint Francis Healthcare System. Dr. Nienaber is also affiliated with Mercy Hospital Southeast. The medical group on file is Saint Francis Medical Center. Dmand AI also links Dr. Nienaber to 3 more hospitals, 2 medical groups and 1 rural health clinic, each named with a free account. Dr. Nienaber's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Joseph Nienaber's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nienaber practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Saint Francis Medical Center | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Saint Francis Healthcare System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William Joseph Nienaber is one of 383 cardiologists in Missouri
Cardiovascular disease is Dr. Nienaber's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Nienaber is licensed in Missouri.
Specialties and state licenses
- Cardiovascular disease, MissouriPrimary
Cardiologists near Dr. Nienaber
Counts of cardiologists 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. William Joseph Nienaber billed Medicare for 5,202 services in 2024
CMS data shows 5,202 Medicare services from Dr. Nienaber across 15 procedure codes in 2024, for 3,266 Medicare patients. Medicare paid $59,220 for them.
Dr. Nienaber's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 4,5272024: 4,99810%
- Imaging
- 2023: 1162024: 17349%
- Office and hospital visits
- 2023: 3402024: 3191%
Where Dr. Nienaber's Medicare services took place, 2024
- In an office49610%
- In a facility4,70690%
Dr. Nienaber compared with the Missouri median for cardiologists, 2024
- Dr. Nienaber
- Missouri median
- Medicare services
- 5,202vs 1,7972.9 times
- Medicare patients
- 3,266vs 9253.5 times
- Part D claims
- 3,126vs 2,12847% above
Medians across 391 cardiologists in Missouri with Dmand AI profiles that report each measure.
Dr. Nienaber'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. Nienaber?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nienaber and other cardiologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Joseph Nienaber treated 3,266 Medicare patients in 2024, average age 75
CMS counts 3,266 Medicare patients who saw Dr. Nienaber in 2024. The largest group is 65 to 74, with 1,239 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 17% are also on Medicaid. Their average risk score is 1.57, 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. Nienaber's median patient age at 73, with 54% women.
Dr. Nienaber's Medicare patients by age, 2024
Dr. Nienaber's Medicare patients by sex, 2024
- Women1,74253%
- Men1,52447%
Chronic conditions among Dr. Nienaber's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis56%
- Ischemic heart disease47%
- Diabetes39%
- Atrial fibrillation38%
- COPD38%
- Anxiety35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nienaber's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Joseph Nienaber wrote 3,208 Medicare Part D claims in 2024
In 2024, Dr. Nienaber wrote 3,208 Medicare Part D claims for 342 patients. 83% of them were for generic drugs. CMS names the drug for 3,126 of them, across 39 drugs with 11 or more claims each, at $359,396 in total drug cost. In 2023, CMS named 3,136 claims across 35 drugs.
Dr. Nienaber's Part D claims by kind of drug, 2024
- Generic2,651 claims83%
- Brand-name557 claims17%
Dr. Nienaber'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,1362024: 3,126No change
Drugs named by CMS: 39 in 2024, 35 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
How Dr. William Joseph Nienaber takes part in Medicare
Dr. Nienaber accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. William Joseph Nienaber received $842 in industry payments from 2016 to 2025
CMS Open Payments shows 48 general payments to Dr. Nienaber from 19 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $148.
General payments to Dr. Nienaber by program year, 2016 to 2025
Companies that paid Dr. Nienaber 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. William Joseph Nienaber graduated from Creighton University School of Medicine
Dr. Nienaber graduated from Creighton University School of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Joseph Nienaber'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| 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. William Joseph Nienaber
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. William Joseph Nienaber's NPI number?
Dr. William Joseph Nienaber's NPI number is 1720296940. It was assigned on May 20, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. William Joseph Nienaber?
Dr. William Joseph Nienaber is a cardiologist in Cape Girardeau, Missouri. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. William Joseph Nienaber practice?
Dr. Nienaber practices at 211 St Francis Dr, Cape Girardeau, MO 63703. Dr. Nienaber's primary practice is Saint Francis Medical Center in Cape Girardeau, Missouri, part of Saint Francis Healthcare System. Dmand AI also links Dr. Nienaber to 3 hospitals, 2 medical groups and 1 rural health clinic.
What is Dr. William Joseph Nienaber's office phone number?
The practice phone on file for Dr. Nienaber is (573) 331-3000.
What is Dr. William Joseph Nienaber's medical license number?
Dr. Nienaber holds Missouri license 2007033628.
Which hospitals is Dr. William Joseph Nienaber affiliated with?
Dr. Nienaber practices at Saint Francis Medical Center in Cape Girardeau, Missouri. Dr. Nienaber is also affiliated with Mercy Hospital Southeast. Dmand AI links Dr. Nienaber to 3 more hospitals.
What medical group is Dr. William Joseph Nienaber part of?
Dr. Nienaber is linked to Saint Francis Medical Center. Dmand AI links Dr. Nienaber to 2 more medical groups.
Does Dr. William Joseph Nienaber accept Medicare?
Yes. CMS data shows Dr. Nienaber billed Medicare for 5,202 services in 2024, and Dr. Nienaber accepts Medicare assignment.
How many Medicare patients does Dr. William Joseph Nienaber see?
CMS counts 3,266 Medicare patients who saw Dr. Nienaber in 2024, with an average age of 75.
What services does Dr. William Joseph Nienaber bill to Medicare?
In 2024, Dr. Nienaber's most billed Medicare services were heart test or procedure (93010), heart test or procedure (93005) and heart test or procedure (93306).
Show 4 more questionsShow fewer questions
Where did Dr. William Joseph Nienaber go to medical school?
Dr. Nienaber graduated from Creighton University School of Medicine in 2005.
What drugs does Dr. William Joseph Nienaber prescribe most?
In 2024 Medicare Part D data, Dr. Nienaber's most prescribed drugs by claims were Metoprolol Succinate, Furosemide and Eliquis.
Has Dr. William Joseph Nienaber received payments from drug or device companies?
CMS Open Payments shows $842 in general payments to Dr. Nienaber from 19 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. William Joseph Nienaber been practicing?
Dr. Nienaber graduated from medical school in 2005, 21 years ago.
Selling to cardiovascular disease practices?
See cardiologists in Missouri by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card