Walter Longo, MD
NPI 1629044649 · Hematology & Oncology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Longo, MD is a Hematology & Oncology Physician provider in Milwaukee, WI (NPI 1629044649).
Provider details
- NPI number
- 1629044649
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 24712 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
438 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 381 | $92 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 31 | $62 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 26 | $33 |
Typical Medicare-allowed amounts for these services range $33–$92 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Acyclovir | 63 | 19 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 59 | 20 |
| Fluconazole | 32 | 12 |
| Apixabanbrand: Eliquis | 27 | — |
| Ruxolitinib Phosphatebrand: Jakafi | 27 | — |
| Oxycodone Hcl | 26 | 11 |
| Lorazepam | 25 |
Practice location
Mailing address
Additional practice locations (1)
- 4805 S Moorland RdNew Berlin, WI 53151-7401Phone: (262) 798-7200Fax: (262) 798-7201
Registry dates
- Enumerated
- 2006-02-28
- Last updated
- 2022-08-05
- Certified
- 2022-08-05
Frequently asked questions
- What is Walter Longo's NPI number?
- Walter Longo's National Provider Identifier (NPI) is 1629044649, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Longo's specialty?
- Walter Longo is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Longo located?
- Walter Longo's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226.
- What is Walter Longo's phone number?
- The practice phone number listed in the NPPES registry for Walter Longo is (414) 805-4600.
- Does Walter Longo accept Medicare?
- Walter Longo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Longo's NPI active?
- Yes — Walter Longo's NPI (1629044649) is active in the NPPES registry as of the last update on 2022-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.