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Edit this profileWhere to find Colin E. Diffie, MD
- Saint Louis location main office
915 N Grand Blvd, Saint Louis, MO 63106 - Saint Louis location
4921 Parkview Pl, Div IM Rheumatology, Ste 5C, Saint Louis, MO 63110
About Dr. Diffie
Based in Saint Louis, MO, Colin E. Diffie, MD is listed in the NPI registry under rheumatology. Colin is also listed as specializing in internal medicine. According to Medicare claims data, Colin cared for 521 Medicare patients across 4,013 services. The services billed most often include injection, methylprednisolone acetate, 1 mg, injection, denosumab, 1 mg, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. NPI 1942616404 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (314) 652-4100
- Email not available
Practice Locations
915 N GRAND BLVD
Saint Louis, MO 63106
4921 Parkview Pl Div IM Rheumatology, Ste 5C
Saint Louis, MO 63110
Conditions Commonly Evaluated or Treated
Within Rheumatology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Autoimmune
- Antiphospholipid Syndrome
- Behçet's Disease
- Dermatomyositis
- Dry Eyes and Mouth
- Granulomatosis with Polyangiitis
- IgA Vasculitis
- IgG4-Related Disease
- Inflammatory myopathy
- Lupus Butterfly Rash
- Positive ANA Blood Test
- Relapsing Polychondritis
Bone
Bone Health
Connective Tissue
- Hypermobility Syndrome
- Mixed Connective Tissue Disease
- Scleroderma skin disease
- Undifferentiated Connective Tissue Disease
Genetic & Connective Tissue
Inflammatory
Joints
- Baker's Cyst
- Chronic Joint Pain
- Enteropathic Arthritis
- Juvenile Idiopathic Arthritis
- Morning Joint Stiffness
- Palindromic Rheumatism
- Pseudogout
- Reactive Arthritis
- Swollen Fingers or Toes
- Swollen Joints
Nerve & Tendon
Skin & Soft Tissue
Skin & Vascular
Soft Tissue
Spine & Back
Vascular
Procedures & services
Most searched procedures
Consultation
Consultations
Diagnostics & Injections
- Baker's Cyst Aspiration
- Bursa injection
- Carpal tunnel steroid injection
- Joint injection or aspiration
- Knee Joint Injection
- Nailfold Capillaroscopy
- Sacroiliac joint injection
- Salivary Gland Biopsy
- Tendon Sheath Injection
Education & Support
Imaging
Injections
- Ankle Joint Injection
- Finger Joint Injections
- Shoulder Cortisone Injection
- Ultrasound-guided hip injection
- Wrist Cortisone Injection
Lab & Diagnostics
- ANCA Blood Test
- Anti-CCP Antibody Test
- HLA-B27 Genetic Test
- Inflammation Blood Tests
- Joint Fluid Analysis
- Lupus Skin Biopsy
- Myositis Antibody Panel
- Rheumatoid Factor Blood Test
Lab Work
Medication Management
- Biologic medication management
- DMARD Medication Management
- Gout Flare Treatment Plan
- Immunosuppressant Drug Monitoring
- Prolia Injection for Osteoporosis
- Reclast Infusion for Osteoporosis
- Steroid Taper Management
Pain Relief
Regenerative Medicine
Procedures Most Often Billed to Medicare
4,013 services · 521 patients · 15 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
23 | Less often than most peers in Rheumatology |
| Aspiration and/or injection of fluid large joint using ultrasound guidance | Procedure | 20611 |
16 | Less often than most peers in Rheumatology |
| Complete ultrasound scan of joint | Imaging | 76881 |
12 | Less often than most peers in Rheumatology |
| Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less | Treatment | 96365 |
66 | As often as other peers in Rheumatology |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
48 | Less often than most peers in Rheumatology |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | Treatment | 96366 |
23 | Less often than most peers in Rheumatology |
| Injection, methylprednisolone acetate, 1 mg | Drug given | J1010 |
1,800 | As often as other peers in Rheumatology |
| Injection, denosumab, 1 mg | Drug given | J0897 |
1,500 | Less often than most peers in Rheumatology |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Drug given | J3301 |
104 | Less often than most peers in Rheumatology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
274 | As often as other peers in Rheumatology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 2
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.
Other rheumatologists in Saint Louis 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2014 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid from large joint 8
Providers in MO who bill this service to Medicare most often.
Common questions
What does Dr. Diffie specialize in?
Dr. Diffie is a rheumatologist in Saint Louis, MO. That is the designation recorded for this NPI in the federal registry, where it is listed as “Rheumatology”.
NPI registry
Where is Dr. Diffie located?
Dr. Diffie is listed at 915 N Grand Blvd, Saint Louis, MO 63106. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Diffie's phone number?
The number on file is (314) 652-4100. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Diffie's NPI number?
Dr. Diffie's National Provider Identifier is 1942616404. 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. Diffie go to medical school?
Dr. Diffie attended Other, graduating in 2014. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Diffie been practicing?
Dr. Diffie has 12 years experience. Calculated from a graduation year of 2014, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Diffie do most often?
According to Medicare billing data, Dr. Diffie performs procedures including aspiration and/or injection of fluid from large joint and aspiration and/or injection of fluid large joint using ultrasound guidance; reads or performs imaging such as complete ultrasound scan of joint; provides treatments such as infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 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
Has Dr. Diffie confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Diffie. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.