John Longo, M.D.
NPI 1356631139 · Radiation Oncology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Longo, M.D. is a Radiation Oncology Physician provider in Milwaukee, WI (NPI 1356631139).
Provider details
- NPI number
- 1356631139
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 57527 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,043 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) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 291 | $43 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 270 | $43 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 62 | $181 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 61 | $62 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 53 | $181 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 49 | $62 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 58 | 18 |
| Omeprazole | 15 | — |
| Lidocaine Hclbrand: Lidocaine Hcl Viscous | 13 | 12 |
| Oxybutynin Chloridebrand: Oxybutynin Chloride Er | 11 | — |
| Prochlorperazine Maleate | 11 | — |
| Ondansetron Hcl | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 9000 W Wisconsin AveMilwaukee, WI 53226-4874Phone: (414) 607-5280Fax: (414) 805-4369
- 3200 Pleasant Valley RdWest Bend, WI 53095-9274Phone: (262) 836-7200Fax: (262) 836-7201
Registry dates
- Enumerated
- 2011-04-13
- Last updated
- 2023-04-07
- Certified
- 2023-04-07
Frequently asked questions
- What is John Longo's NPI number?
- John Longo's National Provider Identifier (NPI) is 1356631139, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Longo's specialty?
- John Longo is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Longo located?
- John Longo's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226-3522.
- What is John Longo's phone number?
- The practice phone number listed in the NPPES registry for John Longo is (414) 805-4400.
- Does John Longo accept Medicare?
- John Longo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Longo's NPI active?
- Yes — John Longo's NPI (1356631139) is active in the NPPES registry as of the last update on 2023-04-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.