William Hass, MD
NPI 1801871637 · Anesthesiology Physician · Huntsville, AL
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Hass, MD is a Anesthesiology Physician provider in Huntsville, AL (NPI 1801871637).
Provider details
- NPI number
- 1801871637
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 19501 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
2,340 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) |
|---|---|---|
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 876 | $59 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 876 | $56 |
| Anesthesia for Exam of Colon Using an Endoscope00812 | 365 | $45 |
| Anesthesia for Procedure on Small and Large Bowel Using an Endoscope00813 | 205 | $69 |
| Anesthesia for Other Procedure on Skin, Muscles, Or Nerves of Head, Neck, and Upper Back00300 | 18 | $72 |
Typical Medicare-allowed amounts for these services range $45–$72 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$205 across 11 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
- 2005-12-14
- Last updated
- 2013-01-15
Frequently asked questions
- What is William Hass's NPI number?
- William Hass's National Provider Identifier (NPI) is 1801871637, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Hass's specialty?
- William Hass is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Hass located?
- William Hass's practice location on file with NPPES is 1 Hospital Dr Sw, Huntsville, AL 35801-6455.
- What is William Hass's phone number?
- The practice phone number listed in the NPPES registry for William Hass is (256) 880-4187.
- Does William Hass accept Medicare?
- William Hass is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Hass's NPI active?
- Yes — William Hass's NPI (1801871637) is active in the NPPES registry as of the last update on 2013-01-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.