William Nienaber, MD
NPI 1720296940 · Cardiovascular Disease Physician · Cape Girardeau, MO
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Nienaber, MD is a Cardiovascular Disease Physician provider in Cape Girardeau, MO (NPI 1720296940).
Provider details
- NPI number
- 1720296940
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2007033628 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,202 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 3,234 | $8 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 481 | $5 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 360 | $63 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Review By Physician93018 | 286 | $13 |
| Heart Muscle Strain Imaging93356 | 190 | $11 |
| Nuclear Medicine Studies of Heart Muscle at Rest and With Stress and Spect |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$197 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-20
- Last updated
- 2021-03-01
- Certified
- 2021-03-01
Frequently asked questions
- What is William Nienaber's NPI number?
- William Nienaber's National Provider Identifier (NPI) is 1720296940, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Nienaber's specialty?
- William Nienaber is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Nienaber located?
- William Nienaber's practice location on file with NPPES is 211 Saint Francis Dr Ste 15, Cape Girardeau, MO 63703-5049.
- What is William Nienaber's phone number?
- The practice phone number listed in the NPPES registry for William Nienaber is (573) 331-3333.
- Does William Nienaber accept Medicare?
- William Nienaber is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Nienaber's NPI active?
- Yes — William Nienaber's NPI (1720296940) is active in the NPPES registry as of the last update on 2021-03-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.