William B. Hass, OD
- Medicare patients, 2024
- 132
- Part D claims, 2024
- 113
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 1180 W Broad St, Chesaning, MI 48616
- Practice phone
- Call (989) 845-3835
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Robert & William Hass Optometrists Professional Corp
Chesaning, Michigan
Find William Hass' 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.
William B. Hass is an optometrist in Chesaning, Michigan
William Hass practices at Robert & William Hass Optometrists Professional Corp in Chesaning, Michigan.
William Hass' NPI, 1972598258, was assigned on September 13, 2005. William Hass graduated from Illinois College of Optometry at Chicago in 1976. William Hass holds Michigan license 4901002552.
- NPI
- 1972598258NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8325134794
- NPI enumeration date
- September 13, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (989) 845-3835
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
William B. Hass practices at Robert & William Hass Optometrists Professional Corp in Chesaning, Michigan
William Hass' primary practice is Robert & William Hass Optometrists Professional Corp, at 1180 W Broad St, Chesaning, MI 48616 in Saginaw County. The practice phone is (989) 845-3835.
- Robert & William Hass Optometrists Professional Corp1180 W Broad St, Chesaning, MI 48616 · Saginaw CountyPhone(989) 845-3835
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
William B. Hass is affiliated with 2 sites of care and 1 medical group
William Hass' primary practice is Robert & William Hass Optometrists Professional Corp in Chesaning, Michigan. Dmand AI also links William Hass to 1 group practice or clinic and 1 medical group, 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 William B. Hass' practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Hass practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Robert & William Hass Optometrists Professional Corp | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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William B. Hass is one of 1,416 optometrists in Michigan
Optometrist is William Hass' primary specialty in the NPI Registry, under taxonomy code 152W00000X. William Hass is licensed in Michigan.
Specialties and state licenses
- Optometrist, MichiganPrimary
Optometrists near William Hass
Counts of optometrists 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
William B. Hass treated 132 Medicare patients in 2024, average age 75
CMS counts 132 Medicare patients who saw William Hass in 2024. The largest group is 65 to 74, with 63 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.17, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts William Hass' median patient age at 72, with 53% women.
William Hass' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
William Hass' Medicare patients by sex, 2024
- Women7658%
- Men5642%
Chronic conditions among William Hass' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Diabetes33%
- Anxiety31%
- Ischemic heart disease28%
- Mood disorders28%
- Depression26%
Share of Medicare patients with each condition. A patient can have several.
William Hass' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
William B. Hass wrote 113 Medicare Part D claims in 2024
In 2024, William Hass wrote 113 Medicare Part D claims for 29 patients. 93% of them were for generic drugs.
William Hass' Part D claims by kind of drug, 2024
- Generic105 claims93%
- Brand-name and other8 claims7%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How William B. Hass takes part in Medicare
William Hass accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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William B. Hass graduated from Illinois College of Optometry at Chicago
William Hass graduated from Illinois College of Optometry at Chicago in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for William B. Hass'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 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 (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)Doctors and Clinicians Utilization Data (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 William B. Hass
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William B. Hass' NPI number?
William B. Hass' NPI number is 1972598258. It was assigned on September 13, 2005, and it is active in the NPI Registry.
What does William B. Hass specialize in?
William B. Hass is an optometrist in Chesaning, Michigan. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does William B. Hass practice?
William Hass practices at 1180 W Broad St, Chesaning, MI 48616. William Hass' primary practice is Robert & William Hass Optometrists Professional Corp in Chesaning, Michigan. Dmand AI also links William Hass to 1 group practice or clinic and 1 medical group.
What is William B. Hass' office phone number?
The practice phone on file for William Hass is (989) 845-3835.
What is William B. Hass' medical license number?
William Hass holds Michigan license 4901002552.
Does William B. Hass accept Medicare?
Yes. CMS lists William Hass as accepting Medicare assignment.
How many Medicare patients does William B. Hass see?
CMS counts 132 Medicare patients who saw William Hass in 2024, with an average age of 75.
Where did William B. Hass go to medical school?
William Hass graduated from Illinois College of Optometry at Chicago in 1976.
How long has William B. Hass been practicing?
William Hass graduated from medical school in 1976, 50 years ago.
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