MARK A CASTELLAW (MD) – Internal Medicine Physician, NPI 1114928793
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,527 INTERNAL MEDICINE in TN
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Provider Addresses for MARK A CASTELLAW (MD)
8040, Wolf River Boulevard, Germantown, Shelby County, Tennessee, 38138, United States
SUITE 200
GERMANTOWN, TN 381381775
Phone: (901) 726-0200
Fax: (901) 278-3050
Type: Location
Rice Box, Atlanta BeltLine Eastside Trail, Atlanta, Georgia, 30308, United States
ATLANTA, GA 303845827
Phone:
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 84 Open Payments records for all available years, with a total value of $1,529.
Total Amount is formed as General ($1,529) + Research ($0) + Ownership ($0) = $1,529.
Last reported payment date: 2024-11-25 • Largest payer in this snapshot: Novo Nordisk Inc ($756).
Total Amount
$1,529
General + Research + Ownership
Payments
84
Total payment records
General Amount
$1,529
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-25
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novo Nordisk Inc | $756 |
| Amgen Inc. | $150 |
| Lilly USA, LLC | $93 |
| AstraZeneca Pharmaceuticals LP | $74 |
| GlaxoSmithKline, LLC. | $68 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-03-29
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100329000270 | I | Internal Medicine | TN | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 36415 | Insertion of needle into vein for collection of blood sample | 2,154 | 823 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 1,857 | 778 | $0 |
| 80061 | Blood test, lipids (cholesterol and triglycerides) | 1,705 | 797 | $0 |
| 82306 | Vitamin d-3 level | 1,312 | 766 | $0 |
| 85025 | Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 1,286 | 748 | $0 |
Insurance plans in this area (ZIP 38138)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERNAL MEDICINE | TN | 73630 | X-ray of foot, minimum of 3 views | 29 | 28 |
| INTERNAL MEDICINE | TN | 74177 | CT scan of abdomen and pelvis with contrast | 17 | 17 |
| INTERNAL MEDICINE | TN | 82270 | Stool analysis for blood to screen for colon tumors | 14 | 14 |
| INTERNAL MEDICINE | TN | 85610 | Blood test, clotting time | 84 | 12 |
| INTERNAL MEDICINE | TN | 90670 | Pneumococcal vaccine for injection into muscle | 64 | 64 |
| INTERNAL MEDICINE | TN | 93922 | Ultrasound study of arteries of both arms and legs | 54 | 33 |
| INTERNAL MEDICINE | TN | 93971 | Ultrasound scan of veins of one arm or leg or limited including assessment of compression and functional maneuvers | 26 | 24 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Osteopathic Manipulative Medicine | NY | |
| H E M A T O L O G Y/ O N C O L O G Y | TN | |
| Family Practice | MS | |
| Nurse Practitioner | GA | |
| Family Practice | GA | |
| Nurse Practitioner | MS | |
| Internal Medicine | AR | |
| Internal Medicine | GA | |
| Nurse Practitioner | TN | |
| Internal Medicine | TN |
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