Earl Williams, MD
NPI 1912561077 · Emergency Medicine Physician · Crystal Lake, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Earl Williams, MD is a Emergency Medicine Physician provider in Crystal Lake, IL (NPI 1912561077).
Provider details
- NPI number
- 1912561077
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 125-076961 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
158 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 78 | $119 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 47 | $169 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 33 | $70 |
Typical Medicare-allowed amounts for these services range $70–$169 (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.
Practice location
Mailing address
Additional practice locations (1)
- 901 Grant StHarvard, IL 60033-1821Phone: (815) 943-5431Fax: (815) 943-0659
Registry dates
- Enumerated
- 2019-04-24
- Last updated
- 2023-10-20
- Certified
- 2023-10-19
Frequently asked questions
- What is Earl Williams's NPI number?
- Earl Williams's National Provider Identifier (NPI) is 1912561077, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Earl Williams's specialty?
- Earl Williams is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Earl Williams located?
- Earl Williams's practice location on file with NPPES is 875 S. Route 31, Crystal Lake, IL 60014.
- What is Earl Williams's phone number?
- The practice phone number listed in the NPPES registry for Earl Williams is (815) 356-7494.
- Does Earl Williams accept Medicare?
- Earl Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Earl Williams's NPI active?
- Yes — Earl Williams's NPI (1912561077) is active in the NPPES registry as of the last update on 2023-10-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.