Physician Profile
Unclaimed ProfileAbout MAHNENSMITH
Rex L Mahnensmith, M.D. is a healthcare provider in Waterbury, CT specialising in internal medicine. Rex trained at Yale University School of Medicine, graduating in 1977. Rex is also listed as specialising in nephrology.
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 is Dr. Mahnensmith's specialty?
Dr. Mahnensmith is an internal medicine in Waterbury, CT. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “INTERNAL MEDICINE”.
NPI registry
Where can I find Dr. Mahnensmith?
Dr. Mahnensmith is listed at 80 PHOENIX AVE, Waterbury, CT 06702. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Mahnensmith?
The number on file is (203) 756-8021. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Mahnensmith's NPI number?
Dr. Mahnensmith's National Provider Identifier is 1760466528. 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
What is Dr. Mahnensmith's medical education?
Dr. Mahnensmith attended Yale University School of Medicine, graduating in 1977. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Mahnensmith been practising?
Dr. Mahnensmith has 49 years experience. Calculated from a graduation year of 1977, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Mahnensmith known for?
According to Medicare billing data, Dr. Mahnensmith provides treatments such as assessment of emotional or behavioral problems, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Mahnensmith confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Mahnensmith. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (203) 756-8021
- Email not available
Practice Locations
80 PHOENIX AVE
Waterbury, CT 06702
Procedures Most Often Billed to Medicare
168 services · 127 patients · 5 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Assessment of emotional or behavioral problems | Treatment | 96127 |
22 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
48 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
45 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
35 |
| Annual depression screening, 5 to 15 minutes | Billing code | G0444 |
18 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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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 internal medicines at this location 5
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
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 — 31 related providers in 4 groups
Other internal medicines in Waterbury 7
Same specialty, same city.
Trained at Yale University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1977 at Yale University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Assessment of emotional or behavioral problems 8
Providers in CT 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.