Dr. Gregory A Naylor , MD
Internal Medicine β’ Jackson, MI
505 N Jackson St
Jackson, MI 492011266
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
-
Dr. Gregory Naylor is listed in NPPES under Internal Medicine.
-
NPI assigned on October 7, 2005; this date does not establish years in practice.
-
Published CMS data list 447 Medicare Part D prescriptions, including refills, in 2014.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2014. Published rows only; this is not a quality measure.
-
Published Part D records, 2014:
- Omeprazole β 69 prescription fills, including refills.
- Atorvastatin Calcium β 51 prescription fills, including refills.
- Lisinopril β 38 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2014. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 19 records in the table Β· Guide: How to read Medicare Part D prescriber data
-
Medicare Part D prescriptions went from 7,017 in 2013 to 447 in 2014.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2013β2014.
Practice Location & Contact Primary Location
505 N Jackson St
Jackson, MI 492011266
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
575 standardized 30-day fills in 2014
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$16,374 in 2014
The total cost of these prescriptions in 2014, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2014.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019β2025.
NPI first issued
2005
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Jackson and Michigan
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Naylor are from 2014.
50 active clinicians are listed under Internal Medicine with a practice address in Jackson, MI (5,741 in Michigan).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Jackson
6% of these 50 clinicians have the CMS telehealth indicator.
62% of these 50 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
-
Medicare Part D prescriptions
Medicare Part D prescriptions decreased 94% from 7,017 in 2013 to 447 in 2014.
- 2013: 7,017
- 2014: 447
-
30-day fills
30-day fills decreased 93% from 8,684 in 2013 to 575 in 2014.
- 2013: 8,684
- 2014: 575
-
Part D drug cost
Part D drug cost decreased 96% from $365,014 in 2013 to $16,374 in 2014.
- 2013: $365,014
- 2014: $16,374
Sources: CMS Medicare Part D Prescribers (2014), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2014.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Omeprazole | Omeprazole | 69 | 2,402 | $815.92 | 23 |
| Atorvastatin Calcium | Atorvastatin Calcium | 51 | 1,830 | $436.08 | 18 |
| Lisinopril | Lisinopril | 38 | 1,575 | $188.11 | 19 |
| Metoprolol Tartrate | Metoprolol Tartrate | 38 | 1,500 | $191.89 | 16 |
| Warfarin Sodium | Warfarin Sodium | 37 | 1,560 | $521.48 | β |
| Metformin Hcl | Metformin Hcl | 31 | 1,110 | $211.98 | β |
| Amlodipine Besylate | Amlodipine Besylate | 23 | 1,110 | $167.84 | 11 |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 21 | 990 | $201.53 | 12 |
| Simvastatin | Simvastatin | 18 | 720 | $85.90 | β |
| Proair Hfa | Albuterol Sulfate | 17 | 321 | $834.63 | β |
| Allopurinol | Allopurinol | 13 | 390 | $122.63 | β |
| Sertraline Hcl | Sertraline Hcl | 12 | 420 | $77.96 | β |
| Clopidogrel | Clopidogrel Bisulfate | 12 | 600 | $173.04 | β |
| Levothyroxine Sodium | Levothyroxine Sodium | 12 | 480 | $129.12 | β |
| Gabapentin | Gabapentin | 11 | 460 | $223.61 | β |
| Carvedilol | Carvedilol | 11 | 330 | $135.73 | β |
| Lantus | Insulin Glargine,hum.Rec.Anlog | 11 | 339 | $11,619.58 | β |
| Losartan Potassium | Losartan Potassium | 11 | 510 | $157.40 | β |
| Glipizide | Glipizide | 11 | 390 | $79.31 | β |
Source: CMS Part D by Provider and Drug, 2014; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Obstetrics & Gynecology
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Doctor of Nursing Practice, Family Nurse Practitioner (Board Certified)
Nurse Practitioner
Nurse Practitioner
Physician Assistant
Physician Assistant
Career & Practice History
NPI enumerated October 07, 2005.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Jackson
- Vikash Kumar
- Dr. Sairia Dass, MBBS MRCP DPHIL
- Dr. Hamsa Khalil, MD
- Dr. Zeeshan Arshad, MD
- Dr. Tahsin Salam Nodi, MD
- Dr. Rose Johnson, MD
Mailing Address
505 N Jackson St
Jackson, MI 492011266
Phone: 5177485500