Dr. William Lewis McMahon, MD, MS
- Medicare services, 2017
- 219
- Part D claims, 2024
- 16
- Hospital affiliations
- 1
- Industry payments
- $23
- Medical groups
- 4
- Practice address
- 1670 Clairmont Road, Decatur, GA 30033
- Practice phone
- Call (404) 321-6111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. McMahon'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 Lewis McMahon is an emergency medicine physician in Decatur, Georgia
Dr. McMahon practices at Joseph Maxwell Cleland Atlanta VA Medical Center in Decatur, Georgia, part of Veterans Health Administration.
Dr. McMahon's NPI, 1891853420, was assigned on December 5, 2006. Dr. McMahon holds Georgia license 45885.
- NPI
- 1891853420NPI Registry (opens in a new tab)
- NPI enumeration date
- December 5, 2006
- NPI status
- Active
- Practice phone
- (404) 321-6111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William Lewis McMahon practices at Joseph Maxwell Cleland Atlanta VA Medical Center in Decatur, Georgia
Dr. McMahon's primary practice is Joseph Maxwell Cleland Atlanta VA Medical Center, at 1670 Clairmont Road, Decatur, GA 30033 in De Kalb County. The practice phone is (404) 321-6111.
- Joseph Maxwell Cleland Atlanta VA Medical Center1670 Clairmont Road, Decatur, GA 30033 · De Kalb CountyPhone(404) 321-6111
Source: Dmand AI Affiliation Data
Dr. William Lewis McMahon is affiliated with 1 site of care and 4 medical groups
Dr. McMahon's primary practice is Joseph Maxwell Cleland Atlanta VA Medical Center in Decatur, Georgia, part of Veterans Health Administration. The medical group on file is ACS Primary Care Physicians - Southeast. Dmand AI also links Dr. McMahon to 3 more medical groups, each named with a free account. Dr. McMahon'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 Lewis McMahon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. McMahon practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Joseph Maxwell Cleland Atlanta VA Medical Center | Available with a free account |
| +3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Lewis McMahon is one of 1,629 emergency medicine physicians in Georgia
Emergency medicine is Dr. McMahon's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. McMahon is licensed in Georgia.
Specialties and state licenses
- Emergency medicine, GeorgiaPrimary
Emergency medicine physicians near Dr. McMahon
Counts of emergency medicine physicians 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 Lewis McMahon billed Medicare for 219 services in 2017
CMS data shows 219 Medicare services from Dr. McMahon across 4 procedure codes in 2017. Medicare paid $27,197 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. McMahon's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Office and hospital visits
- 2016: 802017: 208160%
- Tests and treatments
- 2016: 02017: 11
Dr. McMahon compared with the Georgia median for emergency medicine physicians, 2017
- Dr. McMahon
- Georgia median
- Medicare services
- 219vs 29125% below
- Part D claims
- 12vs 9387% below
Medians across 1,545 emergency medicine physicians in Georgia with Dmand AI profiles that report each measure.
Dr. McMahon's most billed Medicare procedure codes, 2017
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. McMahon?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. McMahon and other emergency medicine physicians in Georgia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Lewis McMahon's patients have a median age of 57
Across all payers, Dmand AI patient panel data puts Dr. McMahon's median patient age at 57, with 43% women.
Dr. McMahon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women43%
- Men57%
Source: Dmand AI Patient Panel Data
Dr. William Lewis McMahon wrote 16 Medicare Part D claims in 2024
In 2024, Dr. McMahon wrote 16 Medicare Part D claims. 100% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $99 in total drug cost.
Dr. McMahon's most prescribed drugs by claims, 2016
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
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
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 Lewis McMahon received $23 in industry payments in 2017
CMS Open Payments shows 2 general payments to Dr. McMahon from 2 drug and device companies in 2017. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $12.
Companies that paid Dr. McMahon the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William Lewis McMahon'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 Data |
| 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) |
| 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 Lewis McMahon
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 Lewis McMahon's NPI number?
Dr. William Lewis McMahon's NPI number is 1891853420. It was assigned on December 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Lewis McMahon?
Dr. William Lewis McMahon is an emergency medicine physician in Decatur, Georgia. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. William Lewis McMahon practice?
Dr. McMahon practices at 1670 Clairmont Road, Decatur, GA 30033. Dr. McMahon's primary practice is Joseph Maxwell Cleland Atlanta VA Medical Center in Decatur, Georgia, part of Veterans Health Administration. Dmand AI also links Dr. McMahon to 3 medical groups.
What is Dr. William Lewis McMahon's office phone number?
The practice phone on file for Dr. McMahon is (404) 321-6111.
What is Dr. William Lewis McMahon's medical license number?
Dr. McMahon holds Georgia license 45885.
Which hospitals is Dr. William Lewis McMahon affiliated with?
Dr. McMahon practices at Joseph Maxwell Cleland Atlanta VA Medical Center in Decatur, Georgia.
What medical group is Dr. William Lewis McMahon part of?
Dr. McMahon is linked to ACS Primary Care Physicians - Southeast. Dmand AI links Dr. McMahon to 3 more medical groups.
Does Dr. William Lewis McMahon accept Medicare?
Yes. CMS data shows Dr. McMahon billed Medicare for 219 services in 2017.
What services does Dr. William Lewis McMahon bill to Medicare?
In 2017, Dr. McMahon's most billed Medicare services were emergency department visit (99285), critical care (99291) and emergency department visit (99284).
What drugs does Dr. William Lewis McMahon prescribe most?
In 2016 Medicare Part D data, Dr. McMahon's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. William Lewis McMahon received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Dr. McMahon from 2 companies from 2017 to 2017. The largest total came from Allergan Inc.
How long has Dr. William Lewis McMahon been practicing?
Dr. McMahon's NPI was assigned in 2006.
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