Physician Profile
Unclaimed ProfileAbout WALLMARK
John M Wallmark, M.D. practices hematology/oncology in Rockville, MD. John is a 1992 graduate of Hahnemann University College of Medicine. John is also listed as specializing in hematology & oncology. Medicare claims data shows John provided 120,597 services to 2,548 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Wallmark specialize in?
Dr. Wallmark is a hematology/oncology in Rockville, MD. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “HEMATOLOGY/ONCOLOGY”.
NPI registry
Where is Dr. Wallmark located?
Dr. Wallmark is listed at 9707 MEDICAL CENTER DR SUITE 300, Rockville, MD 20850. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Wallmark's phone number?
The number on file is (301) 424-6231. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Wallmark?
Dr. Wallmark's National Provider Identifier is 1689755365. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Wallmark go to medical school?
Dr. Wallmark attended Hahnemann University College of Medicine, graduating in 1992. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Wallmark have?
Dr. Wallmark has 34 years experience. Calculated from a graduation year of 1992, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Wallmark do most often?
According to Medicare billing data, Dr. Wallmark provides treatments such as injection of additional new drug or substance into vein and injection of drug or substance under skin or into muscle, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Wallmark's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Wallmark. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (301) 424-6231
- Email not available
Practice Locations
9707 MEDICAL CENTER DR SUITE 300
Rockville, MD 20850
Procedures Most Often Billed to Medicare
120,597 services · 2,548 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Injection of additional new drug or substance into vein | Treatment | 96375 |
461 |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
406 |
| Injection, darbepoetin alfa, 1 microgram (non-esrd use) | Drug given | J0881 |
23,500 |
| Injection, pembrolizumab, 1 mg | Drug given | J9271 |
11,600 |
| Injection, ferric carboxymaltose, 1 mg | Drug given | J1439 |
11,250 |
| Injection, paclitaxel, 1 mg | Drug given | J9267 |
11,156 |
| Injection, daratumumab, 10 mg and hyaluronidase-fihj | Drug given | J9144 |
10,440 |
| Injection, azacitidine, 1 mg | Drug given | J9025 |
10,300 |
| Injection, denosumab, 1 mg | Drug given | J0897 |
7,980 |
| Injection, aprepitant, 1 mg | Drug given | J0185 |
7,540 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Is this your profile?
Verify your identity to control how patients — and AI assistants — describe you.
Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other hematology/oncology specialists at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 28 related providers in 4 groups
Other hematology/oncology specialists in Rockville 4
Same specialty, same city.
Trained at Hahnemann University College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1992 at Hahnemann University College of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Injection of additional new drug or substance into vein 8
Providers in MD who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.