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HealthGait

The Sixth Vital Sign

Your walking speed
is a vital sign.
Do you know yours?

A 2011 JAMA study of 34,485 adults found walking speed below 0.6 m/s predicts markedly reduced 10-year survival — as powerfully as blood pressure or BMI (Studenski et al., JAMA 2011). Most people have never measured theirs. Take the free 10-second test in your kitchen right now.

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Take it yourself

The 10-second walk test

Gait speed below 1.0 m/s predicts hospitalization with ~87% accuracy in older adults. Here is how to measure yours in your kitchen, right now.

How to measure

  1. 1

    Mark a 6-meter (20-foot) path on a flat, unobstructed floor. Add 2 meters at each end for acceleration and deceleration.

  2. 2

    Walk at your comfortable, everyday pace — not fast, not slow. Use any walking aid you normally use.

  3. 3

    A helper starts a stopwatch when your lead foot crosses the start line and stops it when it crosses the finish.

  4. 4

    Repeat three times and enter your best time in the calculator. This is the same test used in every major longevity study.

Your gait speed

meters
seconds

Thresholds: <0.6 frailty / 0.6–1.0 limited mobility / 1.0–1.2 preserved / >1.2 robust

chair

Add a second self-test

30-second sit-to-stand

A live timer scores your lower-body strength against age and sex norms. Walking speed and leg strength together draw the fuller mobility picture.

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The Sixth Vital Sign

Clinical Insight

Walking Speed vs. Longevity

Medical researchers now consider walking speed as crucial as blood pressure or heart rate. It integrates the health of your nervous, skeletal, and cardiovascular systems into one measurable metric.

1.2 m/s Optimal Range
88% Accuracy Rate
analytics

Real-time Metrics

Analyze cadence, step length, and symmetry instantly.

Precision at every step.

HealthGait uses wearable movement data to map your gait profile. By identifying subtle changes over time, we help you and your clinician detect potential health risks long before they manifest as symptoms.

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    Early Risk Detection

    Identify mobility declines 5 years earlier than standard tests.

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    Bespoke Recovery

    Track postoperative recovery with 0.1s precision.

health_and_safety Apple Health + Claude AI

Your watch already knows.
Now your doctor does too.

Apple Health tracks your steps, walking speed, step length, double support time, and walking asymmetry — every day, passively. HealthGait pulls that data through Claude, analyzes trends a physician would miss, and generates billable RTM reports.

1.2 m/s
Walking speed (HealthKit)
88%
Walking symmetry
0.68m
Step length (trending down)
$94/mo
RTM billable (98975, 98976, 98977, 98980, 98981)
watch
Apple Watch collects passively
Steps, gait speed, asymmetry, cadence — no app needed
psychology
Claude analyzes trends
Detects gait deterioration weeks before a fall event
verified
Physician attests via ClinicalSwipe
AI insight becomes billable clinical documentation
payments
RTM codes 98975, 98976, 98977, 98980, 98981
$94-170/mo per patient. 16+ days of data = qualifying
Studenski et al. JAMA 2011

What your walking speed actually predicts

The landmark Studenski study pooled data from 34,485 community-dwelling adults aged 65 and older across 9 cohorts. After controlling for age, sex, chronic conditions, and prior hospitalizations, walking speed remained an independent predictor of survival — as powerful as any single clinical variable. Here is what the zones mean in practice. Not medical advice; share your score with your clinician.

Speed
Clinical Zone
What the evidence says
< 0.6 m/s
Frailty zone
Associated with markedly reduced 10-year survival — from 19% in men to 35% in women at age 75. Linked to fall risk, hospitalization, and loss of community ambulation. Targeted strength and balance training can improve gait speed within 8–12 weeks.
0.6 – 1.0 m/s
Limited mobility
Independent walking indoors, but community ambulation (crossing a timed intersection, managing inclines, stairs under load) may be compromised. The 0.8 m/s mark corresponds to median life expectancy for most ages in the Studenski cohorts.
1.0 – 1.2 m/s
Preserved function
Full community mobility. Consistent survival advantage over the limited-mobility group. At 1.0 m/s or above, 10-year survival in the Studenski cohorts ranged from 57% to 91% depending on age and sex — substantially better than below this threshold.
> 1.2 m/s
Robust
The lowest mortality and disability rates in all long-term studies. At this speed, the additional clinical value shifts to symmetry, cadence consistency, and step-length trends — the metrics Apple Watch captures passively that a timed walk test cannot.
info

Thresholds above are derived from Studenski et al., JAMA 2011, which measured comfortable walking speed on a 4-meter course. Apple Watch measures walking speed passively during normal daily walking; values are comparable but not identical to a standardized 4-meter test. Walking speed is a population-level predictor, not a diagnostic test — a single low reading does not predict individual outcomes. Use these ranges to start a conversation with your clinician, not to draw a conclusion. Not medical advice.

verified

Reviewed by a physician

Content reviewed by Josh Emdur, DO — Board-Certified Hospitalist, 50-state licensed. Last reviewed April 2026. Sources: JAMA 2011 (Studenski), CMS Physician Fee Schedule 2022, CDC STEADI, Apple HealthKit documentation.

Understanding Gait Analysis & RTM Billing

Clinical evidence, billing guidance, and practical implementation for clinicians and health systems.

Walking Speed as the Sixth Vital Sign

A landmark 2011 JAMA study of 34,485 community-dwelling adults (Studenski et al.) found that walking speed was as predictive of survival as age, chronic conditions, smoking history, blood pressure, body mass index, and hospitalization history. Individuals walking faster than 1.0 m/s had survival rates exceeding age-matched norms; those below 0.6 m/s had markedly reduced 10-year survival.

Walking speed integrates the functional state of the neurological, cardiovascular, musculoskeletal, and pulmonary systems into a single measurable number — making it uniquely valuable as a longitudinal health indicator. The NIH Toolbox includes 4-Meter Walk Speed as a standard assessment for this reason. Apple Watch Series 6 and later measures walking speed passively and continuously, generating a clinically meaningful data stream at zero patient burden.

RTM Billing: Codes, Requirements, and Revenue

CMS finalized Remote Therapeutic Monitoring (RTM) codes in the 2022 Physician Fee Schedule. Unlike Remote Patient Monitoring (RPM), RTM covers non-physiologic data including musculoskeletal function, respiratory function, and therapy adherence — making it directly applicable to gait monitoring. The five core codes are 98975 (setup, once per episode), 98976 (device supply, 30-day), 98977 (respiratory device), 98980 (first 20 min clinical time), and 98981 (additional 20 min).

A patient generating 16+ days of gait data in a calendar month qualifies for the device supply codes. Combined with 20 minutes of physician review and patient communication, the monthly reimbursement per patient ranges from $94 to $170 depending on the payer. At 50 active RTM patients, this represents $4,700–$8,500 in monthly recurring revenue from data that your patients are already generating passively. SurgeonValue's RTM billing agent automates the documentation and billing workflow.

Gait Changes as Early Disease Markers

Multiple studies have identified gait changes as early markers for conditions that appear clinically years later. A 2012 Neurology study found that slower walking speed and shorter stride length precede clinical Alzheimer's disease diagnosis by 5–7 years. Gait variability (inconsistency in step timing) is a sensitive marker for Parkinson's disease progression that outperforms clinical motor scoring on some measures.

For post-surgical patients, gait speed recovery curves are the strongest predictor of 90-day readmission risk in total joint replacement — directly relevant to CJR-X bundled payment program performance. A patient whose walking speed at 14 days post-discharge has not returned to 50% of baseline is at significantly elevated readmission risk. FallRisks home assessment pairs with HealthGait to complete the fall-risk picture.

Apple HealthKit: The Passive Gait Data Stream

Apple Watch Series 4 and later measures six validated gait metrics using the device's accelerometer and gyroscope: walking speed, step length, step cadence, walking asymmetry, double support time, and stair ascent/descent speed. Apple's validation studies compare these measurements against research-grade motion capture systems with high agreement (ICC > 0.90 for walking speed).

These metrics are stored in Apple Health as HKQuantityType samples and are accessible via the HealthKit API with user consent. HealthGait pulls this data through the SolvingHealth MCP connector, analyzes 30-day trends, flags clinically significant changes, and generates a physician-ready RTM report. The physician attests via ClinicalSwipe in under 3 minutes.

Integrating Gait Monitoring with Home Care

Gait monitoring is most impactful when embedded in a care coordination framework. A clinician who identifies gait deterioration in isolation has limited ability to act; a care team that includes a home caregiver, physician, and family coordinator can respond to early warning signals with concrete interventions — medication review, physical therapy referral, or home environment assessment.

co-op.care companion caregivers perform structured gait observations during home visits using the same metrics HealthGait tracks remotely, providing a ground-truth check on passive sensor data. CaresCircle family coordination ensures that gait trend alerts reach the right family member immediately, not at the next scheduled call.

Frequently Asked Questions

What RTM codes apply to gait analysis? add
Codes 98975 (setup), 98976 (musculoskeletal device supply, 30-day), 98980 (first 20 min clinical time), and 98981 (additional 20 min) are the core set for gait monitoring. Requires 16+ days of data in a 30-day period and documented clinician review. Combined reimbursement: $94–$170/patient/month depending on payer.
Who bills for gait assessments — physician or therapist? add
RTM codes 98980 and 98981 can be billed by physicians, physical therapists, occupational therapists, and speech-language pathologists under their own NPI. The billing provider must have a documented plan of care and must personally review data and communicate with the patient. SurgeonValue automates the documentation workflow.
How many days of data are required to bill RTM? add
CMS requires at least 16 days of remote monitoring data within a 30-day period to bill device supply codes (98976, 98977). Apple Watch collects gait data passively every day, making 16-day compliance straightforward for patients who wear the device regularly.
What is walking speed and why does it matter clinically? add
Walking speed (gait velocity) is the sixth vital sign. A landmark 2011 JAMA study of 34,485 adults found walking speed was a strong independent predictor of survival. It integrates neurological, cardiovascular, musculoskeletal, and pulmonary health into a single measurable metric — faster than drawing labs for many clinical questions.
Does Medicare reimburse RTM for gait monitoring? add
Yes. CMS finalized RTM reimbursement under the Physician Fee Schedule effective January 2022. RTM codes 98975–98981 are payable by Medicare for musculoskeletal conditions, which includes gait impairment, balance disorders, and fall risk. Apple Watch is classified as a general wellness device under FDA guidance.
What gait metrics does HealthGait measure? add
Six core metrics from Apple Health: walking speed (m/s), step length (m), step cadence (steps/min), walking asymmetry (%), double support time (%), and stair ascent/descent speed. These map directly to the Timed Up and Go test, 10-Meter Walk Test, and Dynamic Gait Index — the gold-standard clinical fall-risk assessments.
Can HealthGait data be used in an EHR? add
HealthGait generates structured reports designed for EHR documentation. The SolvingHealth platform exports FHIR-compatible observation resources for walking speed, step length, and symmetry. Integration with Epic, Cerner, athenahealth, and eClinicalWorks is available through the SurgeonValue EMR onboarding pathway.
How does HealthGait connect to FallRisks? add
FallRisks assesses the home environment — grab bars, lighting, and rugs. HealthGait assesses the individual's gait — walking speed, symmetry, and step length. Together they provide a complete fall risk picture: environmental and physiological. Families can share both datasets with their care team through co-op.care.
Which patients benefit most from gait monitoring? add
Highest-value populations: post-surgical patients (total joint replacement, spine), stroke/TBI rehabilitation, Parkinson's disease, multiple sclerosis, older adults with documented fall history, and patients on high-fall-risk medications. For post-surgical patients, gait speed recovery is a leading indicator of 90-day readmission — directly relevant to CJR-X bundled payment programs.
How is HealthGait different from a clinical gait lab? add
A clinical gait lab uses force plates and motion capture at $800–$3,000 per session. HealthGait uses Apple Watch accelerometer/gyroscope for continuous passive monitoring at near-zero marginal cost. The tradeoff: a lab provides granular biomechanical detail in one session; HealthGait provides longitudinal trend data across months — which is more clinically relevant for fall prediction and RTM billing.

Connected Care Ecosystem

HealthGait is one layer of a complete care system. Pair it with home safety assessment, family coordination, and physician oversight.

FallRisks home assessment co-op.care caregivers SurgeonValue RTM billing CaresCircle family coordination ComfortCard HSA/FSA tracking

Gait data: Apple HealthKit. RTM billing: CMS Physician Fee Schedule 2022. Clinical evidence: JAMA 2011 (Studenski et al.), Neurology 2012. Not a substitute for medical advice. Content reviewed by Josh Emdur, DO, April 2026.

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