Most ACOs treat the BASIC to ENHANCED transition as a risk decision. The data suggests it is a performance signal -- and for BASIC ACOs, the question is whether the gaps that kept you here will follow you there.
The intuitive explanation for ENHANCED outperformance is simple: a higher share rate means more dollars per unit of savings. But the share rate differential does not explain a 26-point gap in MSR clearance rates. That gap reflects something more fundamental.
ACOs that elected ENHANCED track built the documentation infrastructure, utilization management programs, and care coordination capacity to take on symmetric risk. That same infrastructure is what drives MSR clearance. The transition decision is downstream of the operational investment -- and the data shows it clearly.
The median AGND PY HCC score tells the story in one number. ENHANCED ACOs are coding their largest population at near-demographic parity (1.002). BASIC ACOs are at 0.9725 -- a 2.75-point gap that compounds across hundreds of thousands of lives into material benchmark suppression and lower clearance rates.
ENHANCED ACOs are not just earning more per dollar of savings -- they are generating more savings and clearing threshold at a dramatically higher rate. The 26-point MSR clearance gap is not explained by share rate alone. It reflects the operational infrastructure gap between ACOs that took on risk and those that deferred it.
VBC Contract Performance Intelligence — PY2024 — N=476 ACOsSize tertiles computed separately within each track. BASIC breakpoints: ≤8,686 / 8,686--15,806 / >15,806 lives. ENHANCED breakpoints: ≤11,318 / 11,318--22,426 / >22,426 lives.
| Cohort | AGND PY HCC | Median MSR % | Savings Rate | Avg Yr in Agmt | PMPM Savings | MSR Clearance |
|---|---|---|---|---|---|---|
| BASIC TRACK — N=276 | Share Rate <75% | Size breakpoints: ≤8,686 / >15,806 lives | ||||||
Overall(276) |
0.9725 | 2.49% | 3.58% | 3.6 | $41.37 | 62.0% |
Small — ≤8,686 lives(91) |
0.9490 | 3.24% | 4.12% | 3.3 | $49.26 | 60.4% |
Mid — 8,686--15,806 lives(91) |
0.9700 | 2.81% | 2.98% | 3.5 | $35.30 | 57.1% |
Large — >15,806 lives(94) |
0.9890 | 2.25% | 3.48% | 3.8 | $39.91 | 68.1% |
| ENHANCED TRACK — N=200 | Share Rate ≥75% | Size breakpoints: ≤11,318 / >22,426 lives | ||||||
Overall(200) |
1.0020 | 1.00% | 5.09% | 2.7 | $55.18 | 88.5% |
Small — ≤11,318 lives(66) |
0.9985 | 1.00% | 5.01% | 2.9 | $53.22 | 84.8% |
Mid — 11,318--22,426 lives(66) |
0.9925 | 0.75% | 4.82% | 2.2 | $51.86 | 92.4% |
Large — >22,426 lives(68) |
1.0095 | 1.00% | 5.62% | 3.0 | $64.29 | 88.2% |
The BASIC Large paradox: Large BASIC ACOs (>15,806 lives) carry the highest AGND HCC score in the BASIC cohort (0.989) -- closer to demographic parity than their smaller peers -- yet clear MSR at only 68.1%. Compare that to ENHANCED Small ACOs (≤11,318 lives), which clear at 84.8% with a comparable AGND HCC of 0.9985. Scale in BASIC without the operational commitment that comes with ENHANCED does not produce proportional results. The infrastructure gap matters more than the size advantage.
ENHANCED Mid ACOs are the performance benchmark: 92.4% MSR clearance, 4.82% savings rate, $51.86 PMPM. The highest clearance rate in the entire dataset belongs to mid-sized ACOs that elected ENHANCED -- not the largest, most well-resourced systems.
The data identifies three distinct profiles among BASIC ACOs. Where your ACO sits in the size tertile breakdown -- combined with your AGND coding signal and current MSR clearance margin -- tells a more precise story about transition readiness than track type alone.
The benchmark does not reset when you transition to ENHANCED. The coding trajectory, utilization patterns, and documentation infrastructure you built in BASIC become the foundation you are measured against under symmetric risk. Understanding the gap before the transition is the highest-leverage analysis a BASIC ACO can do.
Your AGND HCC is approaching or above demographic parity. You are clearing MSR with margin, not by coincidence. The operational infrastructure is in place. ENHANCED is a share rate upgrade, not an operational leap.
You are clearing MSR but not consistently or with significant margin. Your AGND coding signal suggests documentation decay is suppressing your benchmark. ENHANCED is achievable but the operational gaps need to be closed first -- not after the transition.
Your coding infrastructure is not producing results consistent with ENHANCED performance benchmarks. Transitioning now means taking on symmetric downside risk before the operational drivers are in place. The benchmark headwinds will compound under ENHANCED exposure.
The ACOs staying in BASIC the longest are not being conservative. They are deferring the operational investment that separates a 62% clearance rate from an 88% one -- and that deferral compounds into the benchmark they will be measured against when they do transition.
VBC Contract Performance Intelligence — PY2024 Track AnalysisMost recent CMS MSSP performance year. N=476 ACOs across all agreement periods and track types. BASIC defined as upside share rate <75%. ENHANCED defined as upside share rate ≥75%.
Track type classified using the CMS-published upside share rate. BASIC Level E carries a 50% share rate; ENHANCED carries 75%. ACOs at 75% or above are classified as ENHANCED regardless of stated track level.
Size tertiles computed independently within each track at the 33rd and 66th percentile of attributed lives. BASIC breakpoints: ≤8,686 / 8,686--15,806 / >15,806. ENHANCED breakpoints: ≤11,318 / 11,318--22,426 / >22,426.
MSR clearance defined as gross savings (total benchmark minus total actual expenditure) ≥ MSR threshold dollars (total benchmark x MSR rate). MSR clearance rate = share of ACOs in cohort clearing threshold.
AGND PY HCC is the CMS-published HCC risk score for the Aged Non-Dual Eligible segment in the performance year. Values above 1.0 indicate coding above the demographic baseline. This is a raw score, not a derived metric.
VBC Contract Performance Intelligence is not affiliated with any vendor, platform, or health plan. Analysis derived from CMS public use files. Coding intensity signals and peer cohorts referenced elsewhere are derived metrics of VBC CPI, not CMS-published figures.
The model is already built for every ACO in the program. The conversation can start with your specific coding signal, MSR proximity, and transition readiness on the table.