Margaret Day, M.D.
NPI 1619139979 · Family Medicine Physician · Columbia, MO
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Day, M.D. is a Family Medicine Physician provider in Columbia, MO (NPI 1619139979).
Provider details
- NPI number
- 1619139979
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 2011002937 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
329 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 123 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 106 | $93 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 59 | $64 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 41 | $128 |
Typical Medicare-allowed amounts for these services range $16–$128 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 115 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 223 | 52 |
| Levothyroxine Sodium | 221 | 51 |
| Omeprazole | 194 | 33 |
| Lisinopril | 189 | 46 |
| Amlodipine Besylate | 163 | 37 |
| Hydrochlorothiazide | 144 | 35 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-06-27
- Last updated
- 2023-03-01
- Certified
- 2023-03-01
Frequently asked questions
- What is Margaret Day's NPI number?
- Margaret Day's National Provider Identifier (NPI) is 1619139979, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Day's specialty?
- Margaret Day is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Day located?
- Margaret Day's practice location on file with NPPES is 303 N Keene St Ste 301, Columbia, MO 65201-8053.
- What is Margaret Day's phone number?
- The practice phone number listed in the NPPES registry for Margaret Day is (573) 882-8000.
- Does Margaret Day accept Medicare?
- Margaret Day is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Day's NPI active?
- Yes — Margaret Day's NPI (1619139979) is active in the NPPES registry as of the last update on 2023-03-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.