Chong Ahn, MD
NPI 1871585216 · Internal Medicine Physician · Arlington Heights, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chong Ahn, MD is a Internal Medicine Physician provider in Arlington Heights, IL (NPI 1871585216).
Provider details
- NPI number
- 1871585216
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036-051567 (IL)
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
20 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
380 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 236 | $127 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 58 | $9 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 50 | $14 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 25 | $128 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 11 | $183 |
Typical Medicare-allowed amounts for these services range $9–$183 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 121 | 39 |
| Amlodipine Besylate | 105 | 30 |
| Losartan Potassium | 80 | 29 |
| Levothyroxine Sodium | 78 | 25 |
| Metoprolol Succinate | 69 | 23 |
| Atenolol | 62 | 21 |
| Hydrochlorothiazide | 62 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$22 across 1 record (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
- 2005-08-22
- Last updated
- 2008-11-07
Frequently asked questions
- What is Chong Ahn's NPI number?
- Chong Ahn's National Provider Identifier (NPI) is 1871585216, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chong Ahn's specialty?
- Chong Ahn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Chong Ahn located?
- Chong Ahn's practice location on file with NPPES is 1430 N. Arlington Heights Rd #104, Arlington Heights, IL 60004.
- What is Chong Ahn's phone number?
- The practice phone number listed in the NPPES registry for Chong Ahn is (847) 253-5985.
- Does Chong Ahn accept Medicare?
- Chong Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chong Ahn's NPI active?
- Yes — Chong Ahn's NPI (1871585216) is active in the NPPES registry as of the last update on 2008-11-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.