Ari Ballonoff, MD
NPI 1689720260 · Radiation Oncology Physician · Denver, CO
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ari Ballonoff, MD is a Radiation Oncology Physician provider in Denver, CO (NPI 1689720260).
Provider details
- NPI number
- 1689720260
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 046364 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
222 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Calculation of Radiation Therapy Dose77300 | 66 | $33 |
| Complex Radiation Therapy Planning77263 | 29 | $167 |
| Design and Construction of Complex Radiation Treatment Device77334 | 28 | $60 |
| High Precision Radiation Therapy Planning77301 | 25 | $418 |
| Design and Construction of Radiation Treatment Device for High Precision Radiation Therapy77338 | 25 | $223 |
| Obtaining Respiratory Data Needed to Develop the Optimal Radiation Treatment77293 | 19 | $104 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Nystatin | 23 | 14 |
| Dexamethasone | 21 | 17 |
| Tamsulosin Hcl | 14 | — |
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 no Part D record, 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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$173 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-26
- Last updated
- 2021-06-18
- Certified
- 2021-06-18
Frequently asked questions
- What is Ari Ballonoff's NPI number?
- Ari Ballonoff's National Provider Identifier (NPI) is 1689720260, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ari Ballonoff's specialty?
- Ari Ballonoff is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ari Ballonoff located?
- Ari Ballonoff's practice location on file with NPPES is 1375 E 19th Ave, Denver, CO 80218-1114.
- What is Ari Ballonoff's phone number?
- The practice phone number listed in the NPPES registry for Ari Ballonoff is (303) 338-4545.
- Does Ari Ballonoff accept Medicare?
- Ari Ballonoff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ari Ballonoff's NPI active?
- Yes — Ari Ballonoff's NPI (1689720260) is active in the NPPES registry as of the last update on 2021-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.