Doctor profile · Federal record
Dr. Mark Castellaw, MD
Internal Medicine Physician (CMS: Internal Medicine) · Germantown, TN
- NPI 1114928793
- Accepts Medicare
- MIPS 76.5 / 100 · 2023
- 45 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
8040 Wolf River Boulevard, Suite 200
Germantown, TN 381381775
(901) 726-0200
fax (901) 278-3050 - Mailing address
-
Po Box 405827
Atlanta, GA 303845827
Credentials & registration
- NPI registered
- August 2005 — 21 yrs on file
- Profile last updated
- October 25, 2016
- Year of graduation
- 1981 — 45 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Tennessee #14060
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1114928793. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
19,644
Distinct HCPCS
10
Medicare allowed
$601,585
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
36415 |
Insertion of needle into vein for collection of blood sample | 2,154 | 823 | $8 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 1,857 | 778 | $118 | |
80061 |
Blood test, lipids (cholesterol and triglycerides) | 1,705 | 797 | $13 | |
82306 |
Vitamin d-3 level | 1,312 | 766 | $29 | |
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 1,286 | 748 | $8 | |
80048 |
Blood test, basic group of blood chemicals (calcium, total) | 974 | 490 | $8 | |
82550 |
Creatine kinase (cardiac enzyme) level, total | 901 | 528 | $6 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 880 | 89 | $54 | |
84443 |
Blood test, thyroid stimulating hormone (tsh) | 826 | 574 | $16 | |
80076 |
Liver function blood test panel | 717 | 448 | $8 |
In context: peer comparison
Among 27 peers in Germantown Internal Medicine Physician, average services per provider: 143. This provider delivers 137× the peer median.Open Payments
Industry payments received
All-time total
$551
Transactions
28
Manufacturers
9
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Novo Nordisk INC | 15 | $324.93 | |
| Pfizer INC. | 3 | $46.78 | |
| Abbott Laboratories | 2 | $42.00 | |
| Amgen INC. | 2 | $36.80 | |
| Lilly USA, LLC | 2 | $31.47 | |
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $20.09 | |
| Astellas Pharma US INC | 1 | $16.99 | |
| AstraZeneca Pharmaceuticals Lp | 1 | $16.62 | |
| Bayer Healthcare Pharmaceuticals INC. | 1 | $15.68 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
5,870
Patients
1,621
Total drug cost
$75,756
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amlodipine Besylate | Generic | 632 | 190 | $4,909 |
| Atorvastatin Calcium | Generic | 601 | 158 | $6,849 |
| Losartan Potassium | Generic | 549 | 158 | $7,456 |
| Levothyroxine Sodium | Generic | 510 | 140 | $7,076 |
| Pantoprazole Sodium | Generic | 490 | 147 | $6,982 |
| Rosuvastatin Calcium | Generic | 398 | 121 | $5,718 |
| Omeprazole | Generic | 372 | 107 | $5,211 |
| Metoprolol Succinate | Generic | 337 | 99 | $6,804 |
| Ezetimibe | Generic | 309 | 96 | $9,791 |
| Gabapentin | Generic | 305 | 77 | $3,899 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Castellaw's medical specialty?
Dr. Mark Castellaw practices Internal Medicine Physician in Germantown, TN.
Where does Dr. Mark Castellaw practice?
Dr. Mark Castellaw practices at 8040 Wolf River Boulevard, Germantown, TN 381381775. Office phone: 9017260200.
What is Dr. Mark Castellaw's NPI?
Dr. Mark Castellaw's National Provider Identifier (NPI) is 1114928793, issued by NPPES.
Does Dr. Mark Castellaw accept Medicare assignment?
Yes. Dr. Mark Castellaw accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Castellaw commonly perform?
Top Medicare-reported procedures in 2023: Insertion of needle into vein for collection of blood sample (HCPCS 36415); Established patient office or other outpatient visit (HCPCS 99214); Blood test, lipids (cholesterol and triglycerides) (HCPCS 80061). Source: CMS Medicare Physician & Other Practitioners file.