Healthcare Overhead Reduction: Occupancy Cost Is the Overlooked Lever
MGMA benchmarking data places total medical practice overhead at approximately 60% of gross collections. Staffing dominates that number. Supplies, technology, and malpractice insurance fill the next rows. Occupancy costs, the combined total of base rent, property taxes, insurance pass-throughs, and CAM charges, sit at 6% to 8% of collections and rarely get audited with the same discipline applied to everything else on the cost sheet.
That gap is where advisors who focus exclusively on revenue optimization leave money behind. An RCM practice that optimizes insurance billing, reduces denial rates, and accelerates collections by 5% may deliver $100,000 in incremental collected revenue for a mid-size practice. The same RCM practice that also surfaces a $9,000 annual CAM overcharge delivers that $9,000 at zero cost-of-revenue. The occupancy recovery goes straight to the bottom line.
I built CAMAudit to make the occupancy forensic layer accessible to advisors who are not commercial real estate specialists. The tool automates the comparison of the landlord's annual reconciliation statement against the lease terms and flags every charge that exceeds what the lease allows.
Healthcare Practice Overhead Rate: The percentage of a medical practice's gross collections consumed by operating expenses, including staffing, supplies, technology, malpractice insurance, and occupancy. MGMA benchmarks place the median total overhead rate at approximately 60%. Occupancy costs, which include base rent under the commercial lease plus NNN pass-throughs for property taxes, building insurance, and CAM, typically represent 6% to 8% of collections. CAM is the most variable and least-audited component of occupancy cost.
Why the occupancy line is the largest unaudited expense in healthcare overhead
Staffing costs get audited continuously. Every payroll cycle, every productivity report, every provider compensation benchmark study is an audit of the labor line. Supply costs get audited through group purchasing contracts, vendor rebate programs, and quarterly utilization reviews. Technology costs get reviewed at renewal. Malpractice gets benchmarked annually.
Occupancy gets reviewed almost never.
The base rent is easy to verify: a fixed number in the lease. Property taxes can be cross-checked against county records. Building insurance has a declaration page. But CAM charges, the annual reconciliation from the landlord showing the tenant's proportional share of actual building operating expenses, arrive once per year with a check due within 30 days. Most practices pay without reviewing the calculation.
According to BOMA International's published benchmarking data, commercial operating expense reconciliation errors are a documented phenomenon across property classes, including medical office buildings. Medical office buildings carry elevated per-square-foot operating costs compared to general office buildings, because the shared building services reflect clinical-grade infrastructure: higher-specification HVAC with tighter humidity tolerances, specialized elevator maintenance, clinical utility connections, and security requirements specific to healthcare settings. A larger expense pool means a larger absolute error when billing errors occur.
For a practice paying $14 per square foot in annual CAM on a 3,000 square foot suite, the annual CAM bill is $42,000. A management fee overcharge of just 1% of the operating expense base, if the landlord calculated the fee on a base that includes excluded items, can add $600 to $1,500 to that bill depending on total building operating expenses. A pro-rata share denominator error that excludes vacant space can increase the tenant's share by 15% to 25%.
The expense side gap in RCM advisory work
RCM consultants are trained to see the revenue cycle as a bilateral problem: money comes in from payers, money goes out to operations. The advisory work that generates the most visible ROI lives on the revenue side, reducing denial rates, improving coding accuracy, accelerating cash posting, renegotiating insurer contracts under MGMA survey data benchmarks.
The expense side gets less structured attention. Practice managers track supply costs and staffing ratios with precision because those costs respond immediately and visibly to intervention. Occupancy costs appear fixed. The lease is signed. The rent is the rent. The CAM reconciliation is just the annual adjustment.
That framing is incomplete. CAM is not a fixed cost. It is a calculated cost that the landlord determines using a formula specified in the lease. When the landlord's calculation uses a different pro-rata share denominator than what the lease specifies, or includes management fees calculated on a broader expense base than the lease authorizes, or passes through capital expenditures that the lease excludes, the result is a billing error against a contractual obligation. That error is recoverable.
RCM advisors who recognize this pattern have a structural advantage: they already have the client relationship, they already review the P&L, and they already operate in a framework of finding recoverable dollars. Adding occupancy cost forensics to the engagement scope requires no new client acquisition and no new analytical expertise. It requires a tool that automates the lease-to-reconciliation comparison.
"RCM advisors optimize the revenue side of healthcare operations with precision. After testing reconciliation samples from published audit cases through CAMAudit, the occupancy cost line shows the same kind of unchecked billing errors that RCM work finds in insurance payments. The model for recovery is identical." — Angel Campa, Founder of CAMAudit
What MGMA data reveals about occupancy cost magnitude
MGMA's DataDive Cost and Revenue benchmarking data provides the reference frame for occupancy cost as a percentage of collections. The core finding: occupancy costs at 6% to 8% of gross collections for a median primary care practice, and higher for specialty practices in dedicated medical office buildings.
For a primary care practice collecting $1.5 million annually, that 6% to 8% range translates to $90,000 to $120,000 in annual occupancy cost. CAM typically represents 30% to 50% of total occupancy cost in an NNN or modified gross structure, putting annual CAM expenditure at $27,000 to $60,000.
A 10% billing error on a $40,000 annual CAM bill is $4,000. Compounded over a 3-year lookback period, that is $12,000 in recoverable charges from a single engagement. In collections-equivalent terms at a 60% overhead rate, recovering $12,000 in overpaid CAM delivers the same net income impact as collecting $30,000 in additional gross revenue.
Specialty practices in higher-acuity settings face larger numbers. A multi-provider orthopedic group in a 6,000 square foot MOB suite paying $15/SF in CAM spends $90,000 per year on CAM alone. A 5% overcharge is $4,500 annually; a 3-year lookback recovers $13,500.
These are not hypothetical projections. They are the arithmetic of the reconciliation documents that exist in client files right now, unaudited.
The three CAM overcharge categories most relevant to healthcare tenants
After testing reconciliation samples from published audit cases through CAMAudit, three overcharge categories appear with disproportionate frequency in healthcare commercial leases.
Management fee overcharges
The management fee is a line item in the CAM pool representing the property management company's fee for administering the building. Most commercial leases cap the management fee as a percentage of gross operating expenses or gross revenues. The overcharge occurs when the landlord calculates the fee on a base that is broader than what the lease authorizes.
Common management fee base errors in MOB leases include: calculating the fee on total building revenues including capital recovery items; applying the percentage to a gross figure that includes excluded expense categories; or failing to exclude certain expense types from the fee base as specified in the lease. The result is a management fee that exceeds the lease-authorized amount.
CAMAudit's management fee overcharge detection rule compares the reported fee against the lease cap formula and flags the variance. Per-finding output includes the lease clause reference, the calculated authorized fee, the billed fee, and the dollar difference.
Pro-rata share calculation errors
The pro-rata share formula specifies how the tenant's proportional share of building operating expenses is calculated. The lease defines both the numerator (the tenant's leased area) and the denominator (the building's total leasable area). Errors occur when the landlord's calculation uses a denominator that differs from what the lease specifies.
Healthcare tenants are particularly susceptible to two denominator manipulation patterns. Vacancy exclusions remove unoccupied suites from the denominator, which inflates every occupied tenant's share. Anchor tenant exclusions remove large tenants who negotiated separate CAM structures from the denominator, shifting more of the expense pool onto smaller tenants. If the lease does not authorize these exclusions, the resulting pro-rata share is an overcharge.
ASHRAE standard 62.1 requirements for medical occupancies mean MOB HVAC systems are more complex and more expensive to maintain than standard office HVAC. Higher HVAC maintenance costs in the operating expense pool amplify the impact of pro-rata share denominator errors.
Capital expenditures passed through as operating expenses
Most commercial leases distinguish between operating expenses, which are recurring costs for maintaining and operating the building, and capital expenditures, which are costs for improvements that extend the building's useful life. Under most leases, capital expenditures are either excluded from CAM entirely or amortized over the useful life of the improvement.
The overcharge occurs when a landlord charges a capital cost in full in a single year under the label of "maintenance." Roof replacements, HVAC unit replacements, elevator modernization, and parking lot resurfacing are common examples. IRS Publication 535 guidance on repairs versus improvements, combined with ASC 840 and ASC 842 accounting standards for capital versus operating costs, provides a framework for distinguishing the two categories. The lease's specific language governs what is and is not permitted in the CAM pool.
For a 40,000 square foot MOB where a tenant holds a 7.5% pro-rata share, an HVAC chiller replacement costing $200,000 charged as a single-year maintenance expense rather than amortized over 15 years generates an $11,250 overcharge for that tenant in the reconciliation year.
Adding occupancy cost forensics to a healthcare advisory engagement
The operational integration of CAM audit into an existing healthcare advisory engagement is straightforward. Two additional steps are required:
First, a qualification screen to identify which clients have NNN or modified gross leases with CAM pass-throughs. Gross lease clients do not have CAM exposure. NNN and modified gross lease clients do.
Second, document collection: the most recent CAM reconciliation statement (the annual true-up document from the landlord) and the relevant lease sections covering operating expense definitions, the exclusion list, the pro-rata share formula, and the management fee cap. Most clients have these documents accessible electronically.
From there, the CAMAudit platform processes the documents and returns a findings report. Internal review takes 20 to 45 minutes per engagement. Client delivery follows the same format as any overhead reduction advisory output: findings, dollar impact, recommended actions.
For advisors who prefer to offer the service as a referral rather than a direct engagement, the revenue-sharing program at /partners/revenue-sharing pays a percentage of each audit fee for referred clients. For advisors who want to deliver the service under their own brand, the white-label program at /partners/white-label provisions a branded client environment with the advisor firm's logo and contact information throughout the engagement.
Related resources
- RCM consultant new service line: CAM audit recovery: the full operational guide to adding occupancy cost recovery to an RCM practice
- Medical group CAM audit white label: white-label delivery for advisory firms serving multi-location medical group clients
Sources
- MGMA DataDive Cost and Revenue, Practice Overhead Benchmarks (2025). https://www.mgma.com/data/benchmarking-data/datadive-cost-and-revenue
- BOMA International. Experience Exchange Report (2024). https://www.boma.org/
- IREM. Income/Expense Analysis: Office Buildings (2024). https://www.irem.org/
- ASHRAE. Standard 62.1: Ventilation and Indoor Air Quality (2022). https://www.ashrae.org/
- IRS Publication 535. Business Expenses. https://www.irs.gov/publications/p535
- FASB. ASC 842: Leases. https://www.fasb.org/
Disclaimer: This article provides general educational information about occupancy cost components in medical practice overhead and the role of CAM audit in healthcare advisory engagements. This is not legal, accounting, tax, or financial advice. MGMA benchmark figures are sourced from published MGMA DataDive reports and are national medians; individual practice overhead rates vary. Consult qualified legal and accounting counsel before pursuing CAM disputes or adding new advisory service lines.
Frequently Asked Questions
How much of a medical practice overhead rate comes from occupancy costs?
MGMA benchmarking data places occupancy costs at 6% to 8% of gross collections for a typical medical practice. At a 60% total overhead rate, occupancy is the second-largest overhead category after staffing. For specialty practices in medical office buildings with higher per-square-foot lease rates, the percentage can reach 10% or more.
What is the difference between base rent and CAM in a medical office lease?
Base rent is a fixed monthly amount specified in the lease. CAM is a variable annual charge representing the tenant's proportional share of building common area maintenance expenses. Under a triple-net or NNN lease, the tenant pays base rent plus a pro-rata share of CAM, property taxes, and building insurance.
Why do RCM advisors overlook CAM overcharges when optimizing healthcare overhead?
CAM charges appear as a single line item inside the occupancy cost bucket on the P&L. They look fixed. The reconciliation statement arrives annually from the landlord and is dense enough that most practice managers accept it without detailed review. RCM advisors focused on revenue optimization rarely see the full occupancy cost breakdown.
What types of CAM overcharges are most common in medical office buildings?
The three most common overcharge patterns are: management fee calculated on an unauthorized expense base; pro-rata share calculated using a denominator that excludes vacant or anchor tenant space without lease authorization; and capital expenditures charged as operating expenses rather than amortized or excluded per the lease.
How does a CAM audit fit into an existing RCM or healthcare advisory engagement?
A CAM audit adds one module to an existing overhead reduction engagement: occupancy cost forensics. The advisor collects the reconciliation and lease documents, runs the audit through CAMAudit, and delivers findings in a client meeting. No new infrastructure is required.
What is the typical recovery from a CAM audit for a medical practice?
Recovery amounts depend on the lease and overcharge type. Practices in medical office buildings often see CAM billing errors in the range of $3,000 to $15,000 per year when errors exist. Multi-year lookback provisions in most leases allow recovery of overcharges from the prior 1 to 3 years.