Your ZIP code health score is more than just a number. Learn what each component means, how scores are calculated, and what you can do with this information.
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CartoChrome Team
··6 min read
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Your CartoChrome Health Score distills the healthcare access reality of your ZIP code into a single 0-100 number. But behind that number lies a sophisticated multi-component analysis. Here is how to read and interpret your score.
The Score Scale
Every score falls into one of five tiers:
| Score Range | Label | What It Means |
|-------------|-------|--------------|
| 90-100 | Healthcare Paradise | Exceptional access across all dimensions |
| 70-89 | Excellent Access | Most healthcare needs met within a short drive |
| 50-69 | Moderate Access | Some services require significant travel or wait times |
| 25-49 | Limited Access | Significant gaps in healthcare availability |
| 0-24 | Healthcare Desert | Critical shortage of healthcare services |
The Eight Components
Your overall score is a weighted combination of eight components, each measuring a different dimension of healthcare access:
1. Primary Care Access (~25% weight)
This measures your access to primary care physicians — family medicine, internal medicine, pediatrics, and general practice. It is the most heavily weighted because primary care is the foundation of healthcare access.
2. Emergency/Trauma Access (~20% weight)
How quickly can you reach an emergency room or trauma center? This component uses a sigmoid decay function that drops sharply beyond critical time thresholds, reflecting the reality that minutes matter in emergencies.
Check Your ZIP Code Health Score
See how your area compares across 11 health dimensions
3. Hospital Inpatient (~15% weight)
Beyond emergency care, this measures access to hospital beds, ICU capacity, and quality metrics from CMS Hospital Compare. A nearby hospital with poor outcomes may score lower than a slightly farther one with excellent care.
4. Specialist Access (~15% weight)
This evaluates the breadth and depth of specialty care — cardiologists, oncologists, orthopedic surgeons, and dozens of other specialties. Areas that can only access one or two specialty types score lower than those with comprehensive coverage.
5. Mental Health Access (~10% weight)
Psychiatrists, psychologists, licensed counselors, and substance abuse treatment facilities. Mental health access is one of the largest gaps in American healthcare, and this component highlights where those gaps are deepest.
6. Preventive/Screening (~10% weight)
Access to mammography facilities, colonoscopy providers, immunization sites, and other preventive services. Areas with poor preventive access often have worse long-term health outcomes.
7. Dental Access (~5% weight)
Dental care is often the first type of healthcare people forgo when access is limited. This component measures dentist availability relative to population.
8. Telehealth Modifier
Rather than a standalone weighted component, telehealth acts as a feedback modifier on components 1, 4, 5, and 7. Where broadband is available and telehealth-capable providers serve the area, distance penalties are reduced — but not eliminated, because physical infrastructure matters.
The SDOH Penalty
Social Determinants of Health modify your score downward when community-level disadvantages create barriers to care. Five factors are considered:
Transportation — Percentage of households without a vehicle
Insurance — Percentage of uninsured residents
Poverty — Economic status of the ZIP code
Age vulnerability — Proportion of elderly residents with mobility limitations
Disability — Prevalence of disabilities affecting healthcare access
The SDOH penalty uses a geometric mean, which means a single catastrophic factor can significantly lower the score. This reflects reality: even if providers exist, people without transportation or insurance cannot effectively access them.
How to Use Your Score
Your health score is a starting point, not a final verdict. Here is what you can do:
Compare neighborhoods — If you are moving, compare health scores alongside school ratings and other neighborhood data
Understand the components — A moderate overall score might hide excellent primary care but poor mental health access
Advocate locally — Use the data to support hospital preservation, clinic expansion, or transit improvements in your community
Plan your care — Know which services require travel and plan accordingly
