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Dr. William R. Shaffer, MD
NPI1801044722PAC ID3274686761
- Medicare services, 2024
- 215
- Medicare patients, 2024
- 160
- Part D claims, 2024
- 1,687
- Publications
- 1
- Hospital affiliations
- 3
- Practice address
- 1755 48th St, Boulder, CO 80301
- Practice phone
- Call (303) 604-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Endoscopy Center of the Rockies
Surgery Center - Medicare-Certified · Boulder, Colorado
Find Dr. Shaffer's professional email, personal email and mobile number
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Dr. William R. Shaffer is a neurologist in Boulder, Colorado
Dr. Shaffer practices at Endoscopy Center of the Rockies in Boulder, Colorado.
Dr. Shaffer's NPI, 1801044722, was assigned on September 4, 2008. Dr. Shaffer holds Colorado license DR.0047669.
NPI and contact details
- NPI
- 1801044722NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3274686761
- NPI enumeration date
- September 4, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 604-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William R. Shaffer practices at Endoscopy Center of the Rockies in Boulder, Colorado
Dr. Shaffer's primary practice is Endoscopy Center of the Rockies, at 1755 48th St, Boulder, CO 80301. The practice phone is (303) 604-5000.
- Endoscopy Center of the Rockies1755 48th St, Boulder, CO 80301Phone(303) 604-5000
Source: Dmand AI Affiliation Data
Dr. William R. Shaffer is affiliated with 5 sites of care and 2 medical groups
Dr. Shaffer's primary practice is Endoscopy Center of the Rockies in Boulder, Colorado. Dr. Shaffer is also affiliated with Foothills Hospital. The medical group on file is UCHealth Medical Group. Dmand AI also links Dr. Shaffer to 2 more hospitals, 1 group practice or clinic and 1 medical group, each named with a free account.
Endoscopy Center of the RockiesPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William R. Shaffer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Shaffer practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Endoscopy Center of the Rockies | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William R. Shaffer is one of 322 neurologists in Colorado
Neurology is Dr. Shaffer's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dmand AI has Dr. Shaffer's licenses on file in 2 states: Colorado and Illinois.
Specialties and state licenses
- Neurology, ColoradoPrimary
- Illinois license
Neurologists near Dr. Shaffer
Counts of neurologists with a Dmand AI profile, by place and practice. Each opens the list.
322neurologists in Colorado
7neurologists in Boulder
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William R. Shaffer billed Medicare for 215 services in 2024
CMS data shows 215 Medicare services from Dr. Shaffer across 3 procedure codes in 2024, for 160 Medicare patients. Medicare paid $27,322 for them. Every service was in an office.
Medicare services, 2024215
Medicare patients160
Paid by Medicare$27,322
Procedure codes3
Dr. Shaffer's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1832024: 1754%
- Other services
- 2023: 02024: 40
- Drugs given in the office
- 2023: 13,2002024: 0100%
- Surgery
- 2023: 682024: 0100%
Dr. Shaffer compared with the Colorado median for neurologists, 2024
- Dr. Shaffer
- Colorado median
- Medicare services
- 215vs 33235% below
- Medicare patients
- 160vs 18313% below
- Part D claims
- 1,352vs 3274.1 times
Medians across 308 neurologists in Colorado with Dmand AI profiles that report each measure.
Dr. Shaffer'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. Shaffer?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Shaffer and other neurologists in Colorado.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William R. Shaffer treated 160 Medicare patients in 2024, average age 73
CMS counts 160 Medicare patients who saw Dr. Shaffer in 2024. The largest group is 65 to 74, with 64 patients. 71% of them have high cholesterol, and 55% have high blood pressure. 12% 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 Dr. Shaffer's median patient age at 72, with 59% women.
Medicare patients, 2024160
Average age73
Average risk score1.17
Also on Medicaid12%
Dr. Shaffer's Medicare patients by age, 2024
Dr. Shaffer's Medicare patients by sex, 2024
- Women8754%
- Men7346%
Chronic conditions among Dr. Shaffer's Medicare patients, 2024
- High cholesterol71%
- High blood pressure55%
- Arthritis53%
- Mood disorders39%
- Ischemic heart disease34%
- Anxiety33%
- Depression33%
- Stroke or TIA25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Shaffer's 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
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William R. Shaffer wrote 1,687 Medicare Part D claims in 2024
In 2024, Dr. Shaffer wrote 1,687 Medicare Part D claims for 333 patients. 75% of them were for generic drugs. CMS names the drug for 1,352 of them, across 35 drugs with 11 or more claims each, at $3,252,085 in total drug cost. In 2023, CMS named 3,654 claims across 61 drugs.
Part D claims, 20241,687
Drugs named by CMS35
Total drug cost$3.3M
Part D patients333
Dr. Shaffer's Part D claims by kind of drug, 2024
- Generic1,266 claims75%
- Brand-name421 claims25%
Dr. Shaffer'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. Shaffer's Part D claims, 2024
- Antipsychotics, patients 65 and over1%11 of 1,687 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: 3,6542024: 1,35263%
Drugs named by CMS: 35 in 2024, 61 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 R. Shaffer takes part in Medicare
Dr. Shaffer 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)
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Dr. William R. Shaffer has 1 publication on record
Dmand AI links 1 paper to Dr. Shaffer in 2017. Dr. Shaffer's most frequent co-author is Justin Morris Honce, MD.
Papers1
Dr. Shaffer's most frequent co-authors
Recent publications by Dr. Shaffer
See who Dr. Shaffer researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Shaffer works with, so you can find a warm path to the right neurologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William R. Shaffer received $360,407 in industry payments from 2016 to 2025
CMS Open Payments shows 592 general payments to Dr. Shaffer from 31 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 81% of the total. EMD Serono, Inc. paid the most, $213,976.
General payments to Dr. Shaffer by program year, 2016 to 2025
General payments to Dr. Shaffer by kind, 2016 to 2025
$360.4Kin total
- Speaker and faculty fees$291,68781%
- Consulting fees$35,34010%
- Travel and lodging$20,1036%
- Food and beverage$12,9124%
- Education$3660%
Companies that paid Dr. Shaffer the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William R. Shaffer'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 R. Shaffer
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 R. Shaffer's NPI number?
Dr. William R. Shaffer's NPI number is 1801044722. It was assigned on September 4, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. William R. Shaffer?
Dr. William R. Shaffer is a neurologist in Boulder, Colorado. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. William R. Shaffer practice?
Dr. Shaffer practices at 1755 48th St, Boulder, CO 80301. Dr. Shaffer's primary practice is Endoscopy Center of the Rockies in Boulder, Colorado. Dmand AI also links Dr. Shaffer to 2 hospitals, 1 group practice or clinic and 1 medical group.
What is Dr. William R. Shaffer's office phone number?
The practice phone on file for Dr. Shaffer is (303) 604-5000.
What is Dr. William R. Shaffer's medical license number?
Dr. Shaffer holds Colorado license DR.0047669, one of the licenses on file in 2 states.
Which states has Dr. William R. Shaffer been licensed in?
Dmand AI has state licenses on file for Dr. Shaffer in Colorado and Illinois.
Which hospitals is Dr. William R. Shaffer affiliated with?
Dr. Shaffer is affiliated with Foothills Hospital. Dmand AI links Dr. Shaffer to 2 more hospitals.
What medical group is Dr. William R. Shaffer part of?
Dr. Shaffer is linked to UCHealth Medical Group. Dmand AI links Dr. Shaffer to 1 more medical group.
Does Dr. William R. Shaffer accept Medicare?
Yes. CMS data shows Dr. Shaffer billed Medicare for 215 services in 2024, and Dr. Shaffer accepts Medicare assignment.
How many Medicare patients does Dr. William R. Shaffer see?
CMS counts 160 Medicare patients who saw Dr. Shaffer in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
What services does Dr. William R. Shaffer bill to Medicare?
In 2024, Dr. Shaffer's most billed Medicare services were office visit, established patient (99215), office visit, new patient (99205) and medicare service (G2212).
What drugs does Dr. William R. Shaffer prescribe most?
In 2024 Medicare Part D data, Dr. Shaffer's most prescribed drugs by claims were Baclofen, Diclofenac Sodium and Rebif Rebidose.
Has Dr. William R. Shaffer received payments from drug or device companies?
CMS Open Payments shows $360,407 in general payments to Dr. Shaffer from 31 companies from 2016 to 2025. The largest total came from EMD Serono, Inc.
How long has Dr. William R. Shaffer been practicing?
Dr. Shaffer graduated from medical school in 2004, 22 years ago.
Does Dr. William R. Shaffer do research?
Dmand AI links 1 publication to Dr. Shaffer.
Who does Dr. William R. Shaffer publish with?
Dr. Shaffer's most frequent co-authors are Justin Morris Honce, MD (1 shared paper).
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