Top Systems & Custom Builds

It’s 7 a.m. in pre-op. A circulating nurse is standing at a workstation trying to scan a titanium implant’s barcode into the EHR. The system doesn’t have a barcode scanner field. So she’s hand-typing the lot number into a free-text field in the chart. Thirty seconds per implant. Six implants that day. Five minutes lost to what should have been 10 seconds of work.

That five minutes repeats 250 days a year. That’s 21 hours of manual data entry annually, per nurse. At a multi-specialty ASC with orthopedic volume (where implant-heavy cases are the norm), you can reach 756 hours annually across the nursing staff, the equivalent of one full-time employee, spent typing lot numbers that should have been scanned.

I’ve watched this happen at fifteen different ASCs over the last seven years as an engineering leader. I’ve also watched the same scene play out across OR scheduling, surgical checklists, anesthesia documentation, and patient pre-op intake. Generic EHRs were designed for hospital workflow. Ambulatory surgery centers run on different rules. The mismatch costs time, introduces error, and turns simple processes into workarounds.

This guide walks through what actually matters in an ASC EHR, scores six platforms honestly on those criteria, and shows you the math on when building a custom platform makes financial sense. If you want the broader specialty EHR landscape first, our specialty EHR development guide and cardiology EHR comparison cover adjacent use cases in the same series.

I. Why ASC Workflows Break Generic EHRs at Four Specific Points

The Block Time Problem

Hospital EHRs are built on appointment scheduling. You book a patient for a time slot. The system reserves that slot. Done.

ASC scheduling is different. You don’t schedule appointments. You schedule block time. A surgeon reserves a block, say, 10 a.m. to 1 p.m. on Tuesday and Thursday. Within that block, cases get scheduled and rescheduled based on patient availability, complexity, and cancellations. If a case cancels at 10:15, the next case in the queue moves up. Turnover time between cases is tracked separately from procedure time.

Generic EHRs don’t have block time. They have appointment slots. When you try to force block scheduling into an appointment slot system, you get spreadsheets alongside the EHR. I’ve seen ASCs where OR scheduling still runs on Excel because the EHR can’t handle the workflow.

CMS and accrediting bodies (AAAHC, AAAASF) don’t require EHR-based scheduling. So vendors don’t prioritize it. The result: most ASCs use their EHR for documentation and compliance, then schedule in a separate system.

The Implant Tracking Problem

Federal law requires it. The FDA’s UDI (Unique Device Identifier) Rule, 21 CFR Part 830, mandates that every implantable device used in a procedure be tracked to a specific patient record using the device’s UDI code.

Most generic EHRs don’t have a UDI field. Some have added one in recent years, but implementation is spotty. More commonly, ASCs track implants in a separate implant management system, then manually reconcile with the EHR for compliance audits.

The compliance exposure is real. An FDA audit finds a discrepancy between the implant log and the patient record, and you’re facing a potential warning letter. It happens. I’ve seen it drive ASCs to rebuild their implant tracking from scratch.

The Anesthesia Integration Problem

The anesthesiologist documents in a separate system. The surgeon documents in the EHR. These two records never fully merge.

Why? Most EHRs don’t have native anesthesia documentation templates designed for ASC workflows. So the anesthesiologist uses a dedicated anesthesia information system (ASIS), proprietary software that tracks vitals, medications, airway management, and adverse events. The surgeon’s EHR gets a PDF export of the anesthesia record, if anything.

In a hospital, you live with this friction. It’s built into the workflow. In an ASC, it’s a pain point that runs counter to the whole point of ASCs: efficiency and simplicity.

The CMS Quality Reporting Problem

ASCs participating in Medicare must report a set of quality measures annually under the CMS ASCQR Program. Non-reporting triggers a 2% payment reduction. The core measures include:

• Wrong surgery events (wrong patient, wrong site, wrong side, wrong procedure, wrong implant)
• All-cause unplanned hospital transfer or admission
• Patient burn events
• Prophylactic antibiotic timing and selection
• Healthcare personnel influenza vaccination coverage
• Safe surgery checklist use
• CAHPS for ASCs (patient satisfaction, distinct from HCAHPS, which is inpatient-only)
• And additional measures added under annual rulemaking.

Each measure requires specific data elements in the patient record. Most generic EHRs can’t auto-populate these. ASCs end up manually extracting data at year-end, compiling it in a spreadsheet, and submitting it to CMS. It takes weeks.

A properly wired ASC EHR auto-maps clinical data to each measure, flags missing required elements before submission, and generates a compliant file ready for CMS upload. The same FHIR API integration layer that handles payer prior auth can expose these measure exports, so you’re not building two separate pipes.

Seeing these gaps in your current system? we’ll map your surgical workflow against your current EHR

II. What Does an ASC EHR Actually Need to Do? (6 Capabilities That Actually Matter)

I evaluate ASC EHRs using six filters. If a platform nails four of these, it’s worth a trial. If it nails all six, it’s rare enough to bet on.

1. Block Time Management + OR Utilization Tracking

Not appointment slots. Block time. The system should:

• Let surgeons reserve specific time blocks (e.g., “10 a.m., 1 p.m., Tuesdays and Thursdays”)
• Allow cases to be scheduled and rescheduled within those blocks
• Track turnover time automatically (case end time to next case start time)
• Show OR utilization in real time (how many minutes of the 180-minute block are filled)
• Alert when utilization falls below a target threshold (e.g., <70% utilization = revenue leak)

2. Surgical Checklist Automation

WHO Safe Surgery Checklist or AAAHC equivalent. The system should:

• Display the checklist at time-out automatically
• Require sign-off by the surgeon, anesthetist, and nurse before the case proceeds
• Lock the record if the checklist is incomplete
• Track which items were flagged as risks or abnormal
• Generate a compliance report for accreditation audits

3. UDI-Compliant Implant Tracking

The system should:

• Have a dedicated implant tracking module (not a free-text field)
• Accept barcode scanner input (standard USB barcode readers)
• Auto-populate implant details from the UDI database (name, manufacturer, lot number, expiration date)
• Require manual lot-number entry only if barcode scanning fails
• Generate a UDI compliance report for FDA audits
• Alert if an expired implant is scanned (hard stop: case cannot proceed)

4. Bi-Directional Anesthesia Integration

Not a PDF export. Real integration. The system should:

• Accept anesthesia data directly from the ASIS (anesthesia information system)
• Merge anesthesia findings into the patient’s clinical record in real time
• Display anesthesia complications in the surgeon’s view (not as a separate PDF)
• Allow the surgeon and anesthesiologist to comment on each other’s findings
• Generate a single unified operative report (not separate documents)

5. CMS ASC Quality Reporting Auto-Population

The system should:

• Map clinical data fields to each active ASCQRP measure automatically
• Flag missing required elements in real time (before discharge)
• Generate a submission-ready file in CMS’s required format
• Track historical compliance rates (to show trending to CMS)

6. Patient Flow: Pre-Op Digital Intake + PACU Status Board + Discharge Instructions

The system should:

• Have a patient portal for pre-op questionnaires (medical history, medications, allergies, consent)
• Display a real-time status board showing which patients are in pre-op, in the OR, in PACU, and ready for discharge
• Generate discharge instructions automatically (based on procedure type and complications)
• Send discharge instructions to the patient’s phone (SMS or app notification)

Related read: Best EHR Systems Explained: Cloud, On-Premise, Specialty & More

III. Top 6 ASC / General Surgery EHR Systems (Honest Scorecard)

I’ve seen six platforms in production at surgical practices. Here’s how they score.

SIS (Surgical Information Systems)

1. What it does well: Purpose-built for ASCs. Strong block time management. Excellent OR utilization tracking. Good implant tracking (barcode scanner compatible). Surgical checklist automation. Strong vendor support for ASCs specifically.
2. What it misses: Weak anesthesia integration (still mostly PDF export). Limited FHIR compliance (relevant if you’re trying to share data with payers or post-acute networks). User interface feels dated.
3. Best for: ASCs that prioritize workflow over interoperability. No plans to integrate with hospital system data.
4. Cost: $18K, $28K per surgeon per year, $150K, $250K implementation.

HST Pathways

1. What it does well: Cloud-native. Best patient experience layer (mobile-friendly patient portal, excellent pre-op intake). Strong patient flow from pre-op to discharge. Good CMS quality measure auto-population. Growing implant tracking module.
2. What it misses: Block time management is weak (still appointment-slot-centric). Anesthesia integration limited. Less mature than SIS at pure surgical workflow.
3. Best for: ASCs that want modern UX and don’t mind re-training staff on block-time workarounds.
4. Cost: $15K, $25K per surgeon per year.

Amkai

1. What it does well: ASC-native. Excellent implant tracking with barcode integration (best-in-class). Good block time management. Surgical checklist automation strong. Small install base, but surgical practices love it.
2. What it misses: Anesthesia integration is basic. No real patient portal (pre-op intake is paper-based). Limited CMS reporting sophistication.
3. Best for: Surgical practices prioritizing implant compliance and OR workflow over patient digitalization.
4. Cost: $16K, $24K per surgeon per year.

ModMed Surgery

1. What it does well: ModMed entering the ASC market with a strong product. Cloud-native. Good workflow automation. Growing surgical feature set. Moderate learning curve.
2. What it misses: Implant tracking still maturing. Anesthesia integration not fully baked. Smaller ASC install base means less battle-tested for high-volume ASCs.
3. Best for: ASCs willing to be early adopters of a platform with strong backing and likely feature roadmap.
4. Cost: $14K, $22K per surgeon per year.

Epic ASC Module

1. What it does well: Integrated with Epic’s hospital EHR (if you’re an IDN). Strong surgical documentation. Strong anesthesia integration (Epic’s anesthesia module is solid). Well-staffed vendor support for large systems.
2. What it misses: Block time management is weak (hospital DNA, surgery templates layered on). Overkill for standalone ASCs. High cost. Heavy implementation burden.
3. Best for: ASCs owned by hospital systems or IDNs already on Epic.
4. Cost: $30K, $60K per surgeon per year, $400K, $800K implementation.

Custom Build (FHIR-Native)

1. What it does well: Designed for your specific workflow. All six capabilities nailed. Future-proof (FHIR for interoperability, headless architecture for scale). Owns the code.
2. What it misses: 16, 20 month build. Requires surgical partner + engineering team. Upfront capital.
3. Best for: Large ASCs (12+ surgeons), surgical networks, or practices with specialized procedures no vendor supports.
4. Cost: $350K, $700K upfront, $80K, $150K annual support. Break-even vs licensing by end of Year 2.