Deirdra Greathouse-Williams, MD
NPI 1871549238 · Family Medicine Physician · New Lenox, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Deirdra Greathouse-Williams, MD is a Family Medicine Physician provider in New Lenox, IL (NPI 1871549238).
Provider details
- NPI number
- 1871549238
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 01061341A (IN)
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
502 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 275 | $93 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 88 | $120 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 61 | $133 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $130 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 21 | $82 |
Typical Medicare-allowed amounts for these services range $82–$133 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 76 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 233 | 63 |
| Levothyroxine Sodium | 174 | 46 |
| Pantoprazole Sodium | 150 | 48 |
| Levocetirizine Dihydrochloride | 138 | 46 |
| Metformin Hcl | 119 | 32 |
| Atorvastatin Calcium | 116 | 34 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16 across 1 record (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
- 2006-05-26
- Last updated
- 2013-02-28
Frequently asked questions
- What is Deirdra Greathouse-Williams's NPI number?
- Deirdra Greathouse-Williams's National Provider Identifier (NPI) is 1871549238, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Deirdra Greathouse-Williams's specialty?
- Deirdra Greathouse-Williams is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Deirdra Greathouse-Williams located?
- Deirdra Greathouse-Williams's practice location on file with NPPES is 1890 Silver Cross Blvd, New Lenox, IL 60451-9524.
- What is Deirdra Greathouse-Williams's phone number?
- The practice phone number listed in the NPPES registry for Deirdra Greathouse-Williams is (815) 463-3700.
- Does Deirdra Greathouse-Williams accept Medicare?
- Deirdra Greathouse-Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Deirdra Greathouse-Williams's NPI active?
- Yes — Deirdra Greathouse-Williams's NPI (1871549238) is active in the NPPES registry as of the last update on 2013-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.